diff --git a/Cargo.lock b/Cargo.lock
index 809535e1d..33660f836 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -872,6 +872,15 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "erased-serde"
+version = "0.3.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3de9ad4541d99dc22b59134e7ff8dc3d6c988c89ecd7324bf10a8362b07a2afa"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
@@ -1571,6 +1580,7 @@ name = "meilisearch-error"
 version = "0.22.0"
 dependencies = [
  "actix-http",
+ "serde",
 ]
 
 [[package]]
@@ -1606,6 +1616,7 @@ dependencies = [
  "log",
  "main_error",
  "meilisearch-error",
+ "meilisearch-lib",
  "meilisearch-tokenizer",
  "memmap",
  "milli",
@@ -1646,6 +1657,74 @@ dependencies = [
  "zip",
 ]
 
+[[package]]
+name = "meilisearch-lib"
+version = "0.1.0"
+dependencies = [
+ "actix-cors",
+ "actix-rt",
+ "actix-web",
+ "actix-web-static-files",
+ "anyhow",
+ "arc-swap",
+ "assert-json-diff",
+ "async-stream",
+ "async-trait",
+ "byte-unit",
+ "bytes",
+ "chrono",
+ "crossbeam-channel",
+ "either",
+ "env_logger",
+ "erased-serde",
+ "flate2",
+ "fst",
+ "futures",
+ "futures-util",
+ "heed",
+ "http",
+ "indexmap",
+ "itertools",
+ "log",
+ "main_error",
+ "meilisearch-error",
+ "meilisearch-tokenizer",
+ "memmap",
+ "milli",
+ "mime",
+ "mockall",
+ "num_cpus",
+ "obkv",
+ "once_cell",
+ "parking_lot",
+ "paste",
+ "pin-project",
+ "rand 0.8.4",
+ "rayon",
+ "regex",
+ "reqwest",
+ "rustls",
+ "serde",
+ "serde_json",
+ "serde_url_params",
+ "serdeval",
+ "sha2",
+ "siphasher",
+ "slice-group-by",
+ "structopt",
+ "sysinfo",
+ "tar",
+ "tempdir",
+ "tempfile",
+ "thiserror",
+ "tokio",
+ "tokio-stream",
+ "urlencoding",
+ "uuid",
+ "walkdir",
+ "whoami",
+]
+
 [[package]]
 name = "meilisearch-tokenizer"
 version = "0.2.5"
diff --git a/Cargo.toml b/Cargo.toml
index a1dca038e..fc64a107f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,7 @@
 members = [
     "meilisearch-http",
     "meilisearch-error",
+    "meilisearch-lib",
 ]
 
 [profile.release]
diff --git a/meilisearch-error/Cargo.toml b/meilisearch-error/Cargo.toml
index 810270183..612e92821 100644
--- a/meilisearch-error/Cargo.toml
+++ b/meilisearch-error/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2018"
 
 [dependencies]
 actix-http = "=3.0.0-beta.10"
+serde = { version = "1.0.130", features = ["derive"] }
diff --git a/meilisearch-error/src/lib.rs b/meilisearch-error/src/lib.rs
index 5e08317a9..9d5b79f69 100644
--- a/meilisearch-error/src/lib.rs
+++ b/meilisearch-error/src/lib.rs
@@ -1,6 +1,7 @@
 use std::fmt;
 
 use actix_http::http::StatusCode;
+use serde::{Serialize, Deserialize};
 
 pub trait ErrorCode: std::error::Error {
     fn error_code(&self) -> Code;
@@ -45,6 +46,7 @@ impl fmt::Display for ErrorType {
     }
 }
 
+#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
 pub enum Code {
     // index related error
     CreateIndex,
diff --git a/meilisearch-http/Cargo.toml b/meilisearch-http/Cargo.toml
index 02e72668b..eb3d550ab 100644
--- a/meilisearch-http/Cargo.toml
+++ b/meilisearch-http/Cargo.toml
@@ -45,6 +45,7 @@ indexmap = { version = "1.7.0", features = ["serde-1"] }
 itertools = "0.10.1"
 log = "0.4.14"
 main_error = "0.1.1"
+meilisearch-lib = { path = "../meilisearch-lib" }
 meilisearch-error = { path = "../meilisearch-error" }
 meilisearch-tokenizer = { git = "https://github.com/meilisearch/tokenizer.git", tag = "v0.2.5" }
 memmap = "0.7.0"
diff --git a/meilisearch-http/src/analytics.rs b/meilisearch-http/src/analytics.rs
index 11347175b..8d91c9e9c 100644
--- a/meilisearch-http/src/analytics.rs
+++ b/meilisearch-http/src/analytics.rs
@@ -4,8 +4,8 @@ use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
 use log::debug;
 use serde::Serialize;
 use siphasher::sip::SipHasher;
+use meilisearch_lib::MeiliSearch;
 
-use crate::Data;
 use crate::Opt;
 
 const AMPLITUDE_API_KEY: &str = "f7fba398780e06d8fe6666a9be7e3d47";
@@ -18,8 +18,8 @@ struct EventProperties {
 }
 
 impl EventProperties {
-    async fn from(data: Data) -> anyhow::Result<EventProperties> {
-        let stats = data.index_controller.get_all_stats().await?;
+    async fn from(data: MeiliSearch) -> anyhow::Result<EventProperties> {
+        let stats = data.get_all_stats().await?;
 
         let database_size = stats.database_size;
         let last_update_timestamp = stats.last_update.map(|u| u.timestamp());
@@ -62,7 +62,7 @@ struct AmplitudeRequest<'a> {
     events: Vec<Event<'a>>,
 }
 
-pub async fn analytics_sender(data: Data, opt: Opt) {
+pub async fn analytics_sender(data: MeiliSearch, opt: Opt) {
     let username = whoami::username();
     let hostname = whoami::hostname();
     let platform = whoami::platform();
diff --git a/meilisearch-http/src/data/mod.rs b/meilisearch-http/src/data/mod.rs
deleted file mode 100644
index a4cd274ff..000000000
--- a/meilisearch-http/src/data/mod.rs
+++ /dev/null
@@ -1,86 +0,0 @@
-use std::ops::Deref;
-use std::sync::Arc;
-
-use crate::index::{Checked, Settings};
-use crate::index_controller::{
-    error::Result, DumpInfo, IndexController, IndexMetadata, IndexStats, Stats,
-};
-use crate::option::Opt;
-
-pub mod search;
-mod updates;
-
-#[derive(Clone)]
-pub struct Data {
-    inner: Arc<DataInner>,
-}
-
-impl Deref for Data {
-    type Target = DataInner;
-
-    fn deref(&self) -> &Self::Target {
-        &self.inner
-    }
-}
-
-pub struct DataInner {
-    pub index_controller: IndexController,
-    //pub api_keys: ApiKeys,
-}
-
-impl Data {
-    pub fn new(options: Opt) -> anyhow::Result<Data> {
-        let path = options.db_path.clone();
-
-        let index_controller = IndexController::new(&path, &options)?;
-
-        let inner = DataInner {
-            index_controller,
-        };
-        let inner = Arc::new(inner);
-
-        Ok(Data { inner })
-    }
-
-    pub async fn settings(&self, uid: String) -> Result<Settings<Checked>> {
-        self.index_controller.settings(uid).await
-    }
-
-    pub async fn list_indexes(&self) -> Result<Vec<IndexMetadata>> {
-        self.index_controller.list_indexes().await
-    }
-
-    pub async fn index(&self, uid: String) -> Result<IndexMetadata> {
-        self.index_controller.get_index(uid).await
-    }
-
-    //pub async fn create_index(
-        //&self,
-        //uid: String,
-        //primary_key: Option<String>,
-    //) -> Result<IndexMetadata> {
-        //let settings = IndexSettings {
-            //uid: Some(uid),
-            //primary_key,
-        //};
-
-        //let meta = self.index_controller.create_index(settings).await?;
-        //Ok(meta)
-    //}
-
-    pub async fn get_index_stats(&self, uid: String) -> Result<IndexStats> {
-        Ok(self.index_controller.get_index_stats(uid).await?)
-    }
-
-    pub async fn get_all_stats(&self) -> Result<Stats> {
-        Ok(self.index_controller.get_all_stats().await?)
-    }
-
-    pub async fn create_dump(&self) -> Result<DumpInfo> {
-        Ok(self.index_controller.create_dump().await?)
-    }
-
-    pub async fn dump_status(&self, uid: String) -> Result<DumpInfo> {
-        Ok(self.index_controller.dump_info(uid).await?)
-    }
-}
diff --git a/meilisearch-http/src/data/search.rs b/meilisearch-http/src/data/search.rs
deleted file mode 100644
index 5ad8d4a07..000000000
--- a/meilisearch-http/src/data/search.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-use serde_json::{Map, Value};
-
-use super::Data;
-use crate::index::{SearchQuery, SearchResult};
-use crate::index_controller::error::Result;
-
-impl Data {
-    pub async fn search(&self, index: String, search_query: SearchQuery) -> Result<SearchResult> {
-        self.index_controller.search(index, search_query).await
-    }
-
-    pub async fn retrieve_documents(
-        &self,
-        index: String,
-        offset: usize,
-        limit: usize,
-        attributes_to_retrieve: Option<Vec<String>>,
-    ) -> Result<Vec<Map<String, Value>>> {
-        self.index_controller
-            .documents(index, offset, limit, attributes_to_retrieve)
-            .await
-    }
-
-    pub async fn retrieve_document(
-        &self,
-        index: String,
-        document_id: String,
-        attributes_to_retrieve: Option<Vec<String>>,
-    ) -> Result<Map<String, Value>> {
-        self.index_controller
-            .document(index, document_id, attributes_to_retrieve)
-            .await
-    }
-}
diff --git a/meilisearch-http/src/data/updates.rs b/meilisearch-http/src/data/updates.rs
deleted file mode 100644
index 8228cd2b2..000000000
--- a/meilisearch-http/src/data/updates.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-use crate::index_controller::Update;
-use crate::index_controller::{error::Result, IndexMetadata, IndexSettings, UpdateStatus};
-use crate::Data;
-
-impl Data {
-    pub async fn register_update(&self, index_uid: &str, update: Update) -> Result<UpdateStatus> {
-        let status = self.index_controller.register_update(index_uid, update).await?;
-        Ok(status)
-    }
-
-    pub async fn get_update_status(&self, index: String, uid: u64) -> Result<UpdateStatus> {
-        self.index_controller.update_status(index, uid).await
-    }
-
-    pub async fn get_updates_status(&self, index: String) -> Result<Vec<UpdateStatus>> {
-        self.index_controller.all_update_status(index).await
-    }
-
-    pub async fn update_index(
-        &self,
-        uid: String,
-        primary_key: Option<String>,
-        new_uid: Option<String>,
-    ) -> Result<IndexMetadata> {
-        let settings = IndexSettings {
-            uid: new_uid,
-            primary_key,
-        };
-
-        self.index_controller.update_index(uid, settings).await
-    }
-}
diff --git a/meilisearch-http/src/error.rs b/meilisearch-http/src/error.rs
index 61b8dbcd9..c18c32ea5 100644
--- a/meilisearch-http/src/error.rs
+++ b/meilisearch-http/src/error.rs
@@ -55,18 +55,6 @@ impl aweb::error::ResponseError for ResponseError {
     }
 }
 
-macro_rules! internal_error {
-    ($target:ty : $($other:path), *) => {
-        $(
-            impl From<$other> for $target {
-                fn from(other: $other) -> Self {
-                    Self::Internal(Box::new(other))
-                }
-            }
-        )*
-    }
-}
-
 #[derive(Debug)]
 pub struct MilliError<'a>(pub &'a milli::Error);
 
diff --git a/meilisearch-http/src/lib.rs b/meilisearch-http/src/lib.rs
index af7e776d7..307bbcefa 100644
--- a/meilisearch-http/src/lib.rs
+++ b/meilisearch-http/src/lib.rs
@@ -38,7 +38,6 @@
 //! Most of the routes use [extractors] to handle the authentication.
 
 #![allow(rustdoc::private_intra_doc_links)]
-pub mod data;
 #[macro_use]
 pub mod error;
 #[macro_use]
@@ -46,11 +45,8 @@ pub mod extractors;
 #[cfg(all(not(debug_assertions), feature = "analytics"))]
 pub mod analytics;
 pub mod helpers;
-mod index;
-mod index_controller;
 pub mod option;
 pub mod routes;
-pub use self::data::Data;
 use crate::extractors::authentication::AuthConfig;
 pub use option::Opt;
 
@@ -58,6 +54,7 @@ use actix_web::web;
 
 use extractors::authentication::policies::*;
 use extractors::payload::PayloadConfig;
+use meilisearch_lib::MeiliSearch;
 use sha2::Digest;
 
 #[derive(Clone)]
@@ -86,14 +83,14 @@ impl ApiKeys {
 
 pub fn configure_data(
     config: &mut web::ServiceConfig,
-    data: Data,
+    data: MeiliSearch,
     opt: &Opt,
     ) {
     let http_payload_size_limit = opt.http_payload_size_limit.get_bytes() as usize;
     config
-        .app_data(web::Data::new(data.clone()))
-        // TODO!: Why are we passing the data with two different things?
         .app_data(data)
+        // TODO!: Why are we passing the data with two different things?
+        //.app_data(data)
         .app_data(
             web::JsonConfig::default()
                 .limit(http_payload_size_limit)
diff --git a/meilisearch-http/src/main.rs b/meilisearch-http/src/main.rs
index 3c796f29d..77f439d05 100644
--- a/meilisearch-http/src/main.rs
+++ b/meilisearch-http/src/main.rs
@@ -1,7 +1,8 @@
 use std::env;
 
 use actix_web::HttpServer;
-use meilisearch_http::{create_app, Data, Opt};
+use meilisearch_http::{create_app, Opt};
+use meilisearch_lib::MeiliSearch;
 use structopt::StructOpt;
 
 #[cfg(all(not(debug_assertions), feature = "analytics"))]
@@ -39,6 +40,26 @@ fn setup(opt: &Opt) -> anyhow::Result<()> {
     Ok(())
 }
 
+fn setup_meilisearch(opt: &Opt) -> anyhow::Result<MeiliSearch> {
+    let mut meilisearch = MeiliSearch::builder();
+    meilisearch
+        .set_max_index_size(opt.max_index_size.get_bytes() as usize)
+        .set_max_update_store_size(opt.max_udb_size.get_bytes() as usize)
+        .set_ignore_missing_snapshot(opt.ignore_missing_snapshot)
+        .set_ignore_snapshot_if_db_exists(opt.ignore_snapshot_if_db_exists)
+        .set_dump_dst(opt.dumps_dir.clone())
+        .set_snapshot_dir(opt.snapshot_dir.clone());
+
+    if let Some(ref path) = opt.import_snapshot {
+        meilisearch.set_import_snapshot(path.clone());
+    }
+    if let Some(ref path) = opt.import_dump {
+        meilisearch.set_dump_src(path.clone());
+    }
+
+    meilisearch.build(opt.db_path.clone(), opt.indexer_options.clone())
+}
+
 #[actix_web::main]
 async fn main() -> anyhow::Result<()> {
     let opt = Opt::from_args();
@@ -55,23 +76,23 @@ async fn main() -> anyhow::Result<()> {
         _ => unreachable!(),
     }
 
-    let data = Data::new(opt.clone())?;
+    let meilisearch = setup_meilisearch(&opt)?;
 
     #[cfg(all(not(debug_assertions), feature = "analytics"))]
     if !opt.no_analytics {
-        let analytics_data = data.clone();
+        let analytics_data = meilisearch.clone();
         let analytics_opt = opt.clone();
         tokio::task::spawn(analytics::analytics_sender(analytics_data, analytics_opt));
     }
 
     print_launch_resume(&opt);
 
-    run_http(data, opt).await?;
+    run_http(meilisearch, opt).await?;
 
     Ok(())
 }
 
-async fn run_http(data: Data, opt: Opt) -> anyhow::Result<()> {
+async fn run_http(data: MeiliSearch, opt: Opt) -> anyhow::Result<()> {
     let _enable_dashboard = &opt.env == "development";
     let opt_clone = opt.clone();
     let http_server = HttpServer::new(move || create_app!(data, _enable_dashboard, opt_clone))
diff --git a/meilisearch-http/src/option.rs b/meilisearch-http/src/option.rs
index 3a0ab8acb..2a4d425e9 100644
--- a/meilisearch-http/src/option.rs
+++ b/meilisearch-http/src/option.rs
@@ -8,7 +8,6 @@ use std::sync::Arc;
 use std::fs;
 
 use byte_unit::Byte;
-use milli::CompressionType;
 use rustls::internal::pemfile::{certs, pkcs8_private_keys, rsa_private_keys};
 use rustls::{
     AllowAnyAnonymousOrAuthenticatedClient, AllowAnyAuthenticatedClient, NoClientAuth,
@@ -16,56 +15,7 @@ use rustls::{
 };
 use structopt::StructOpt;
 use sysinfo::{RefreshKind, System, SystemExt};
-
-#[derive(Debug, Clone, StructOpt)]
-pub struct IndexerOpts {
-    /// The amount of documents to skip before printing
-    /// a log regarding the indexing advancement.
-    #[structopt(long, default_value = "100000")] // 100k
-    pub log_every_n: usize,
-
-    /// Grenad max number of chunks in bytes.
-    #[structopt(long)]
-    pub max_nb_chunks: Option<usize>,
-
-    /// The maximum amount of memory the indexer will use. It defaults to 2/3
-    /// of the available memory. It is recommended to use something like 80%-90%
-    /// of the available memory, no more.
-    ///
-    /// In case the engine is unable to retrieve the available memory the engine will
-    /// try to use the memory it needs but without real limit, this can lead to
-    /// Out-Of-Memory issues and it is recommended to specify the amount of memory to use.
-    #[structopt(long, default_value)]
-    pub max_memory: MaxMemory,
-
-    /// The name of the compression algorithm to use when compressing intermediate
-    /// Grenad chunks while indexing documents.
-    ///
-    /// Choosing a fast algorithm will make the indexing faster but may consume more memory.
-    #[structopt(long, default_value = "snappy", possible_values = &["snappy", "zlib", "lz4", "lz4hc", "zstd"])]
-    pub chunk_compression_type: CompressionType,
-
-    /// The level of compression of the chosen algorithm.
-    #[structopt(long, requires = "chunk-compression-type")]
-    pub chunk_compression_level: Option<u32>,
-
-    /// Number of parallel jobs for indexing, defaults to # of CPUs.
-    #[structopt(long)]
-    pub indexing_jobs: Option<usize>,
-}
-
-impl Default for IndexerOpts {
-    fn default() -> Self {
-        Self {
-            log_every_n: 100_000,
-            max_nb_chunks: None,
-            max_memory: MaxMemory::default(),
-            chunk_compression_type: CompressionType::None,
-            chunk_compression_level: None,
-            indexing_jobs: None,
-        }
-    }
-}
+use meilisearch_lib::options::IndexerOpts;
 
 const POSSIBLE_ENV: [&str; 2] = ["development", "production"];
 
diff --git a/meilisearch-http/src/routes/dump.rs b/meilisearch-http/src/routes/dump.rs
index 72bc55986..a598f875b 100644
--- a/meilisearch-http/src/routes/dump.rs
+++ b/meilisearch-http/src/routes/dump.rs
@@ -1,17 +1,17 @@
 use actix_web::{web, HttpResponse};
 use log::debug;
+use meilisearch_lib::MeiliSearch;
 use serde::{Deserialize, Serialize};
 
 use crate::error::ResponseError;
 use crate::extractors::authentication::{policies::*, GuardedData};
-use crate::Data;
 
 pub fn configure(cfg: &mut web::ServiceConfig) {
     cfg.service(web::resource("").route(web::post().to(create_dump)))
         .service(web::resource("/{dump_uid}/status").route(web::get().to(get_dump_status)));
 }
 
-pub async fn create_dump(data: GuardedData<Private, Data>) -> Result<HttpResponse, ResponseError> {
+pub async fn create_dump(data: GuardedData<Private, MeiliSearch>) -> Result<HttpResponse, ResponseError> {
     let res = data.create_dump().await?;
 
     debug!("returns: {:?}", res);
@@ -30,10 +30,10 @@ struct DumpParam {
 }
 
 async fn get_dump_status(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<DumpParam>,
 ) -> Result<HttpResponse, ResponseError> {
-    let res = data.dump_status(path.dump_uid.clone()).await?;
+    let res = data.dump_info(path.dump_uid.clone()).await?;
 
     debug!("returns: {:?}", res);
     Ok(HttpResponse::Ok().json(res))
diff --git a/meilisearch-http/src/routes/indexes/documents.rs b/meilisearch-http/src/routes/indexes/documents.rs
index be80a55a0..b7d13d16b 100644
--- a/meilisearch-http/src/routes/indexes/documents.rs
+++ b/meilisearch-http/src/routes/indexes/documents.rs
@@ -3,6 +3,8 @@ use actix_web::{web, HttpResponse};
 use actix_web::web::Bytes;
 use futures::{Stream, StreamExt};
 use log::debug;
+use meilisearch_lib::MeiliSearch;
+use meilisearch_lib::index_controller::{DocumentAdditionFormat, Update};
 use milli::update::IndexDocumentsMethod;
 use serde::Deserialize;
 //use serde_json::Value;
@@ -11,9 +13,7 @@ use tokio::sync::mpsc;
 use crate::error::ResponseError;
 use crate::extractors::authentication::{policies::*, GuardedData};
 use crate::extractors::payload::Payload;
-use crate::index_controller::{DocumentAdditionFormat, Update};
 use crate::routes::IndexParam;
-use crate::Data;
 
 const DEFAULT_RETRIEVE_DOCUMENTS_OFFSET: usize = 0;
 const DEFAULT_RETRIEVE_DOCUMENTS_LIMIT: usize = 20;
@@ -88,20 +88,20 @@ pub fn configure(cfg: &mut web::ServiceConfig) {
 }
 
 pub async fn get_document(
-    data: GuardedData<Public, Data>,
+    data: GuardedData<Public, MeiliSearch>,
     path: web::Path<DocumentParam>,
 ) -> Result<HttpResponse, ResponseError> {
     let index = path.index_uid.clone();
     let id = path.document_id.clone();
     let document = data
-        .retrieve_document(index, id, None as Option<Vec<String>>)
+        .document(index, id, None as Option<Vec<String>>)
         .await?;
     debug!("returns: {:?}", document);
     Ok(HttpResponse::Ok().json(document))
 }
 
 //pub async fn delete_document(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //path: web::Path<DocumentParam>,
 //) -> Result<HttpResponse, ResponseError> {
     //let update_status = data
@@ -120,7 +120,7 @@ pub struct BrowseQuery {
 }
 
 pub async fn get_all_documents(
-    data: GuardedData<Public, Data>,
+    data: GuardedData<Public, MeiliSearch>,
     path: web::Path<IndexParam>,
     params: web::Query<BrowseQuery>,
 ) -> Result<HttpResponse, ResponseError> {
@@ -137,7 +137,7 @@ pub async fn get_all_documents(
     });
 
     let documents = data
-        .retrieve_documents(
+        .documents(
             path.index_uid.clone(),
             params.offset.unwrap_or(DEFAULT_RETRIEVE_DOCUMENTS_OFFSET),
             params.limit.unwrap_or(DEFAULT_RETRIEVE_DOCUMENTS_LIMIT),
@@ -157,7 +157,7 @@ pub struct UpdateDocumentsQuery {
 /// Route used when the payload type is "application/json"
 /// Used to add or replace documents
 pub async fn add_documents(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<IndexParam>,
     params: web::Query<UpdateDocumentsQuery>,
     body: Payload,
@@ -180,7 +180,7 @@ pub async fn add_documents(
 /// Route used when the payload type is "application/json"
 /// Used to add or replace documents
 pub async fn update_documents(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<IndexParam>,
     params: web::Query<UpdateDocumentsQuery>,
     body: Payload,
@@ -201,7 +201,7 @@ pub async fn update_documents(
 }
 
 //pub async fn delete_documents(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //path: web::Path<IndexParam>,
     //body: web::Json<Vec<Value>>,
 //) -> Result<HttpResponse, ResponseError> {
@@ -221,7 +221,7 @@ pub async fn update_documents(
 //}
 
 //pub async fn clear_all_documents(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //path: web::Path<IndexParam>,
 //) -> Result<HttpResponse, ResponseError> {
     //let update_status = data.clear_documents(path.index_uid.clone()).await?;
diff --git a/meilisearch-http/src/routes/indexes/mod.rs b/meilisearch-http/src/routes/indexes/mod.rs
index ef68215b4..da7008640 100644
--- a/meilisearch-http/src/routes/indexes/mod.rs
+++ b/meilisearch-http/src/routes/indexes/mod.rs
@@ -1,12 +1,13 @@
 use actix_web::{web, HttpResponse};
 use chrono::{DateTime, Utc};
 use log::debug;
+use meilisearch_lib::MeiliSearch;
+use meilisearch_lib::index_controller::IndexSettings;
 use serde::{Deserialize, Serialize};
 
 use crate::error::ResponseError;
 use crate::extractors::authentication::{policies::*, GuardedData};
 use crate::routes::IndexParam;
-use crate::Data;
 
 pub mod documents;
 pub mod search;
@@ -35,7 +36,7 @@ pub fn configure(cfg: &mut web::ServiceConfig) {
     );
 }
 
-pub async fn list_indexes(data: GuardedData<Private, Data>) -> Result<HttpResponse, ResponseError> {
+pub async fn list_indexes(data: GuardedData<Private, MeiliSearch>) -> Result<HttpResponse, ResponseError> {
     let indexes = data.list_indexes().await?;
     debug!("returns: {:?}", indexes);
     Ok(HttpResponse::Ok().json(indexes))
@@ -49,7 +50,7 @@ pub struct IndexCreateRequest {
 }
 
 //pub async fn create_index(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //body: web::Json<IndexCreateRequest>,
 //) -> Result<HttpResponse, ResponseError> {
     //let body = body.into_inner();
@@ -75,30 +76,34 @@ pub struct UpdateIndexResponse {
 }
 
 pub async fn get_index(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<IndexParam>,
 ) -> Result<HttpResponse, ResponseError> {
-    let meta = data.index(path.index_uid.clone()).await?;
+    let meta = data.get_index(path.index_uid.clone()).await?;
     debug!("returns: {:?}", meta);
     Ok(HttpResponse::Ok().json(meta))
 }
 
 pub async fn update_index(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<IndexParam>,
     body: web::Json<UpdateIndexRequest>,
 ) -> Result<HttpResponse, ResponseError> {
     debug!("called with params: {:?}", body);
     let body = body.into_inner();
+    let settings = IndexSettings {
+        uid: body.uid,
+        primary_key: body.primary_key,
+    };
     let meta = data
-        .update_index(path.into_inner().index_uid, body.primary_key, body.uid)
+        .update_index(path.into_inner().index_uid, settings)
         .await?;
     debug!("returns: {:?}", meta);
     Ok(HttpResponse::Ok().json(meta))
 }
 
 //pub async fn delete_index(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //path: web::Path<IndexParam>,
 //) -> Result<HttpResponse, ResponseError> {
     //data.delete_index(path.index_uid.clone()).await?;
@@ -106,7 +111,7 @@ pub async fn update_index(
 //}
 
 pub async fn get_index_stats(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<IndexParam>,
 ) -> Result<HttpResponse, ResponseError> {
     let response = data.get_index_stats(path.index_uid.clone()).await?;
diff --git a/meilisearch-http/src/routes/indexes/search.rs b/meilisearch-http/src/routes/indexes/search.rs
index 83f58648e..2b68e6ed6 100644
--- a/meilisearch-http/src/routes/indexes/search.rs
+++ b/meilisearch-http/src/routes/indexes/search.rs
@@ -1,13 +1,13 @@
 use actix_web::{web, HttpResponse};
 use log::debug;
+use meilisearch_lib::MeiliSearch;
+use  meilisearch_lib::index::{default_crop_length, SearchQuery, DEFAULT_SEARCH_LIMIT};
 use serde::Deserialize;
 use serde_json::Value;
 
 use crate::error::ResponseError;
 use crate::extractors::authentication::{policies::*, GuardedData};
-use crate::index::{default_crop_length, SearchQuery, DEFAULT_SEARCH_LIMIT};
 use crate::routes::IndexParam;
-use crate::Data;
 
 pub fn configure(cfg: &mut web::ServiceConfig) {
     cfg.service(
@@ -82,7 +82,7 @@ impl From<SearchQueryGet> for SearchQuery {
 }
 
 pub async fn search_with_url_query(
-    data: GuardedData<Public, Data>,
+    data: GuardedData<Public, MeiliSearch>,
     path: web::Path<IndexParam>,
     params: web::Query<SearchQueryGet>,
 ) -> Result<HttpResponse, ResponseError> {
@@ -99,7 +99,7 @@ pub async fn search_with_url_query(
 }
 
 pub async fn search_with_post(
-    data: GuardedData<Public, Data>,
+    data: GuardedData<Public, MeiliSearch>,
     path: web::Path<IndexParam>,
     params: web::Json<SearchQuery>,
 ) -> Result<HttpResponse, ResponseError> {
diff --git a/meilisearch-http/src/routes/indexes/settings.rs b/meilisearch-http/src/routes/indexes/settings.rs
index 051483b20..07a96003f 100644
--- a/meilisearch-http/src/routes/indexes/settings.rs
+++ b/meilisearch-http/src/routes/indexes/settings.rs
@@ -148,7 +148,7 @@
 //);
 
 //pub async fn update_all(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //index_uid: web::Path<String>,
     //body: web::Json<Settings<Unchecked>>,
 //) -> Result<HttpResponse, ResponseError> {
@@ -162,7 +162,7 @@
 //}
 
 //pub async fn get_all(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //index_uid: web::Path<String>,
 //) -> Result<HttpResponse, ResponseError> {
     //let settings = data.settings(index_uid.into_inner()).await?;
@@ -171,7 +171,7 @@
 //}
 
 //pub async fn delete_all(
-    //data: GuardedData<Private, Data>,
+    //data: GuardedData<Private, MeiliSearch>,
     //index_uid: web::Path<String>,
 //) -> Result<HttpResponse, ResponseError> {
     //let settings = Settings::cleared();
diff --git a/meilisearch-http/src/routes/indexes/updates.rs b/meilisearch-http/src/routes/indexes/updates.rs
index 471636abf..547977790 100644
--- a/meilisearch-http/src/routes/indexes/updates.rs
+++ b/meilisearch-http/src/routes/indexes/updates.rs
@@ -1,12 +1,12 @@
 use actix_web::{web, HttpResponse};
 use chrono::{DateTime, Utc};
 use log::debug;
+use meilisearch_lib::MeiliSearch;
 use serde::{Deserialize, Serialize};
 
 use crate::error::ResponseError;
 use crate::extractors::authentication::{policies::*, GuardedData};
 use crate::routes::{IndexParam, UpdateStatusResponse};
-use crate::Data;
 
 pub fn configure(cfg: &mut web::ServiceConfig) {
     cfg.service(web::resource("").route(web::get().to(get_all_updates_status)))
@@ -37,12 +37,12 @@ pub struct UpdateParam {
 }
 
 pub async fn get_update_status(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<UpdateParam>,
 ) -> Result<HttpResponse, ResponseError> {
     let params = path.into_inner();
     let meta = data
-        .get_update_status(params.index_uid, params.update_id)
+        .update_status(params.index_uid, params.update_id)
         .await?;
     let meta = UpdateStatusResponse::from(meta);
     debug!("returns: {:?}", meta);
@@ -50,10 +50,10 @@ pub async fn get_update_status(
 }
 
 pub async fn get_all_updates_status(
-    data: GuardedData<Private, Data>,
+    data: GuardedData<Private, MeiliSearch>,
     path: web::Path<IndexParam>,
 ) -> Result<HttpResponse, ResponseError> {
-    let metas = data.get_updates_status(path.into_inner().index_uid).await?;
+    let metas = data.all_update_status(path.into_inner().index_uid).await?;
     let metas = metas
         .into_iter()
         .map(UpdateStatusResponse::from)
diff --git a/meilisearch-http/src/routes/mod.rs b/meilisearch-http/src/routes/mod.rs
index 12b0612ad..6c99d1766 100644
--- a/meilisearch-http/src/routes/mod.rs
+++ b/meilisearch-http/src/routes/mod.rs
@@ -5,12 +5,12 @@ use chrono::{DateTime, Utc};
 use log::debug;
 use serde::{Deserialize, Serialize};
 
+use meilisearch_lib::{MeiliSearch, UpdateResult, UpdateStatus, RegisterUpdate};
+use meilisearch_lib::index::{Settings, Unchecked};
+
 use crate::error::ResponseError;
 use crate::extractors::authentication::{policies::*, GuardedData};
-use crate::index::{Settings, Unchecked};
-use crate::index_controller::update_actor::RegisterUpdate;
-use crate::index_controller::{UpdateResult, UpdateStatus};
-use crate::{ApiKeys, Data};
+use crate::ApiKeys;
 
 mod dump;
 mod indexes;
@@ -187,15 +187,17 @@ impl From<UpdateStatus> for UpdateStatusResponse {
                 let duration = Duration::from_millis(duration as u64).as_secs_f64();
 
                 let update_id = failed.id();
-                let response = failed.error;
+                let processed_at = failed.failed_at;
+                let enqueued_at = failed.from.from.enqueued_at;
+                let response = failed.into();
 
                 let content = FailedUpdateResult {
                     update_id,
                     update_type,
                     response,
                     duration,
-                    enqueued_at: failed.from.from.enqueued_at,
-                    processed_at: failed.failed_at,
+                    enqueued_at,
+                    processed_at,
                 };
                 UpdateStatusResponse::Failed { content }
             }
@@ -230,7 +232,7 @@ pub async fn running() -> HttpResponse {
     HttpResponse::Ok().json(serde_json::json!({ "status": "MeiliSearch is running" }))
 }
 
-async fn get_stats(data: GuardedData<Private, Data>) -> Result<HttpResponse, ResponseError> {
+async fn get_stats(data: GuardedData<Private, MeiliSearch>) -> Result<HttpResponse, ResponseError> {
     let response = data.get_all_stats().await?;
 
     debug!("returns: {:?}", response);
@@ -245,7 +247,7 @@ struct VersionResponse {
     pkg_version: String,
 }
 
-async fn get_version(_data: GuardedData<Private, Data>) -> HttpResponse {
+async fn get_version(_data: GuardedData<Private, MeiliSearch>) -> HttpResponse {
     let commit_sha = option_env!("VERGEN_GIT_SHA").unwrap_or("unknown");
     let commit_date = option_env!("VERGEN_GIT_COMMIT_TIMESTAMP").unwrap_or("unknown");
 
@@ -288,7 +290,7 @@ mod test {
     macro_rules! impl_is_policy {
         ($($param:ident)*) => {
             impl<Policy, Func, $($param,)* Res> Is<Policy, (($($param,)*), Res)> for Func
-                where Func: Fn(GuardedData<Policy, Data>, $($param,)*) -> Res {}
+                where Func: Fn(GuardedData<Policy, MeiliSearch>, $($param,)*) -> Res {}
 
         };
     }
diff --git a/meilisearch-lib/Cargo.toml b/meilisearch-lib/Cargo.toml
new file mode 100644
index 000000000..7ef4ecad7
--- /dev/null
+++ b/meilisearch-lib/Cargo.toml
@@ -0,0 +1,72 @@
+[package]
+name = "meilisearch-lib"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+actix-cors = { git = "https://github.com/MarinPostma/actix-extras.git", rev = "963ac94d" }
+actix-web = { version = "4.0.0-beta.9", features = ["rustls"] }
+actix-web-static-files = { git = "https://github.com/MarinPostma/actix-web-static-files.git", rev = "39d8006", optional = true }
+anyhow = { version = "1.0.43", features = ["backtrace"] }
+async-stream = "0.3.2"
+async-trait = "0.1.51"
+arc-swap = "1.3.2"
+byte-unit = { version = "4.0.12", default-features = false, features = ["std"] }
+bytes = "1.1.0"
+chrono = { version = "0.4.19", features = ["serde"] }
+crossbeam-channel = "0.5.1"
+either = "1.6.1"
+env_logger = "0.9.0"
+flate2 = "1.0.21"
+fst = "0.4.7"
+futures = "0.3.17"
+futures-util = "0.3.17"
+heed = { git = "https://github.com/Kerollmops/heed", tag = "v0.12.1" }
+http = "0.2.4"
+indexmap = { version = "1.7.0", features = ["serde-1"] }
+itertools = "0.10.1"
+log = "0.4.14"
+main_error = "0.1.1"
+meilisearch-error = { path = "../meilisearch-error" }
+meilisearch-tokenizer = { git = "https://github.com/meilisearch/tokenizer.git", tag = "v0.2.5" }
+memmap = "0.7.0"
+milli = { git = "https://github.com/meilisearch/milli.git", rev = "6de1b41" }
+mime = "0.3.16"
+num_cpus = "1.13.0"
+once_cell = "1.8.0"
+parking_lot = "0.11.2"
+rand = "0.8.4"
+rayon = "1.5.1"
+regex = "1.5.4"
+rustls = "0.19.1"
+serde = { version = "1.0.130", features = ["derive"] }
+serde_json = { version = "1.0.67", features = ["preserve_order"] }
+sha2 = "0.9.6"
+siphasher = "0.3.7"
+slice-group-by = "0.2.6"
+structopt = "0.3.23"
+tar = "0.4.37"
+tempfile = "3.2.0"
+thiserror = "1.0.28"
+tokio = { version = "1.11.0", features = ["full"] }
+uuid = { version = "0.8.2", features = ["serde"] }
+walkdir = "2.3.2"
+obkv = "0.2.0"
+pin-project = "1.0.8"
+whoami = { version = "1.1.3", optional = true }
+reqwest = { version = "0.11.4", features = ["json", "rustls-tls"], default-features = false, optional = true }
+serdeval = "0.1.0"
+sysinfo = "0.20.2"
+tokio-stream = "0.1.7"
+erased-serde = "0.3.16"
+
+[dev-dependencies]
+actix-rt = "2.2.0"
+assert-json-diff = { branch = "master", git = "https://github.com/qdequele/assert-json-diff" }
+mockall = "0.10.2"
+paste = "1.0.5"
+serde_url_params = "0.2.1"
+tempdir = "0.3.7"
+urlencoding = "2.1.0"
diff --git a/meilisearch-lib/src/error.rs b/meilisearch-lib/src/error.rs
new file mode 100644
index 000000000..80141dae5
--- /dev/null
+++ b/meilisearch-lib/src/error.rs
@@ -0,0 +1,62 @@
+use std::error::Error;
+use std::fmt;
+
+use meilisearch_error::{Code, ErrorCode};
+use milli::UserError;
+
+macro_rules! internal_error {
+    ($target:ty : $($other:path), *) => {
+        $(
+            impl From<$other> for $target {
+                fn from(other: $other) -> Self {
+                    Self::Internal(Box::new(other))
+                }
+            }
+        )*
+    }
+}
+
+#[derive(Debug)]
+pub struct MilliError<'a>(pub &'a milli::Error);
+
+impl Error for MilliError<'_> {}
+
+impl fmt::Display for MilliError<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl ErrorCode for MilliError<'_> {
+    fn error_code(&self) -> Code {
+        match self.0 {
+            milli::Error::InternalError(_) => Code::Internal,
+            milli::Error::IoError(_) => Code::Internal,
+            milli::Error::UserError(ref error) => {
+                match error {
+                    // TODO: wait for spec for new error codes.
+                    | UserError::SerdeJson(_)
+                    | UserError::MaxDatabaseSizeReached
+                    | UserError::InvalidCriterionName { .. }
+                    | UserError::InvalidDocumentId { .. }
+                    | UserError::InvalidStoreFile
+                    | UserError::NoSpaceLeftOnDevice
+                    | UserError::InvalidAscDescSyntax { .. }
+                    | UserError::DocumentLimitReached => Code::Internal,
+                    UserError::AttributeLimitReached => Code::MaxFieldsLimitExceeded,
+                    UserError::InvalidFilter(_) => Code::Filter,
+                    UserError::InvalidFilterAttribute(_) => Code::Filter,
+                    UserError::InvalidSortName { .. } => Code::Sort,
+                    UserError::MissingDocumentId { .. } => Code::MissingDocumentId,
+                    UserError::MissingPrimaryKey => Code::MissingPrimaryKey,
+                    UserError::PrimaryKeyCannotBeChanged => Code::PrimaryKeyAlreadyPresent,
+                    UserError::PrimaryKeyCannotBeReset => Code::PrimaryKeyAlreadyPresent,
+                    UserError::SortRankingRuleMissing => Code::Sort,
+                    UserError::UnknownInternalDocumentId { .. } => Code::DocumentNotFound,
+                    UserError::InvalidFacetsDistribution { .. } => Code::BadRequest,
+                    UserError::InvalidSortableAttribute { .. } => Code::Sort,
+                }
+            }
+        }
+    }
+}
diff --git a/meilisearch-http/src/index/dump.rs b/meilisearch-lib/src/index/dump.rs
similarity index 99%
rename from meilisearch-http/src/index/dump.rs
rename to meilisearch-lib/src/index/dump.rs
index 9c8acf960..018ae6d2f 100644
--- a/meilisearch-http/src/index/dump.rs
+++ b/meilisearch-lib/src/index/dump.rs
@@ -6,7 +6,7 @@ use heed::RoTxn;
 use indexmap::IndexMap;
 use serde::{Deserialize, Serialize};
 
-use crate::option::IndexerOpts;
+use crate::options::IndexerOpts;
 
 use super::error::Result;
 use super::{Index, Settings, Unchecked};
diff --git a/meilisearch-http/src/index/error.rs b/meilisearch-lib/src/index/error.rs
similarity index 100%
rename from meilisearch-http/src/index/error.rs
rename to meilisearch-lib/src/index/error.rs
diff --git a/meilisearch-http/src/index/mod.rs b/meilisearch-lib/src/index/mod.rs
similarity index 99%
rename from meilisearch-http/src/index/mod.rs
rename to meilisearch-lib/src/index/mod.rs
index 1ea481ec9..c05e337e2 100644
--- a/meilisearch-http/src/index/mod.rs
+++ b/meilisearch-lib/src/index/mod.rs
@@ -14,7 +14,7 @@ use error::Result;
 pub use search::{default_crop_length, SearchQuery, SearchResult, DEFAULT_SEARCH_LIMIT};
 pub use updates::{Checked, Facets, Settings, Unchecked};
 
-use crate::helpers::EnvSizer;
+use crate::EnvSizer;
 use crate::index_controller::update_file_store::UpdateFileStore;
 
 use self::error::IndexError;
diff --git a/meilisearch-http/src/index/search.rs b/meilisearch-lib/src/index/search.rs
similarity index 100%
rename from meilisearch-http/src/index/search.rs
rename to meilisearch-lib/src/index/search.rs
diff --git a/meilisearch-http/src/index/update_handler.rs b/meilisearch-lib/src/index/update_handler.rs
similarity index 96%
rename from meilisearch-http/src/index/update_handler.rs
rename to meilisearch-lib/src/index/update_handler.rs
index 0ad71d313..8fba55341 100644
--- a/meilisearch-http/src/index/update_handler.rs
+++ b/meilisearch-lib/src/index/update_handler.rs
@@ -5,7 +5,7 @@ use rayon::ThreadPool;
 
 use crate::index_controller::update_actor::RegisterUpdate;
 use crate::index_controller::{Failed, Processed, Processing};
-use crate::option::IndexerOpts;
+use crate::options::IndexerOpts;
 
 pub struct UpdateHandler {
     max_nb_chunks: Option<usize>,
@@ -66,7 +66,7 @@ impl UpdateHandler {
 
         match result {
             Ok(result) => Ok(meta.process(result)),
-            Err(e) => Err(meta.fail(e.into())),
+            Err(e) => Err(meta.fail(e)),
         }
     }
 }
diff --git a/meilisearch-http/src/index/updates.rs b/meilisearch-lib/src/index/updates.rs
similarity index 100%
rename from meilisearch-http/src/index/updates.rs
rename to meilisearch-lib/src/index/updates.rs
diff --git a/meilisearch-http/src/index_controller/dump_actor/actor.rs b/meilisearch-lib/src/index_controller/dump_actor/actor.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/dump_actor/actor.rs
rename to meilisearch-lib/src/index_controller/dump_actor/actor.rs
diff --git a/meilisearch-http/src/index_controller/dump_actor/error.rs b/meilisearch-lib/src/index_controller/dump_actor/error.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/dump_actor/error.rs
rename to meilisearch-lib/src/index_controller/dump_actor/error.rs
diff --git a/meilisearch-http/src/index_controller/dump_actor/handle_impl.rs b/meilisearch-lib/src/index_controller/dump_actor/handle_impl.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/dump_actor/handle_impl.rs
rename to meilisearch-lib/src/index_controller/dump_actor/handle_impl.rs
diff --git a/meilisearch-http/src/index_controller/dump_actor/loaders/mod.rs b/meilisearch-lib/src/index_controller/dump_actor/loaders/mod.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/dump_actor/loaders/mod.rs
rename to meilisearch-lib/src/index_controller/dump_actor/loaders/mod.rs
diff --git a/meilisearch-http/src/index_controller/dump_actor/loaders/v1.rs b/meilisearch-lib/src/index_controller/dump_actor/loaders/v1.rs
similarity index 99%
rename from meilisearch-http/src/index_controller/dump_actor/loaders/v1.rs
rename to meilisearch-lib/src/index_controller/dump_actor/loaders/v1.rs
index 21893eb49..584828b4e 100644
--- a/meilisearch-http/src/index_controller/dump_actor/loaders/v1.rs
+++ b/meilisearch-lib/src/index_controller/dump_actor/loaders/v1.rs
@@ -11,7 +11,7 @@ use crate::index_controller::{self, uuid_resolver::HeedUuidStore, IndexMetadata}
 use crate::index_controller::{asc_ranking_rule, desc_ranking_rule};
 use crate::{
     index::Unchecked,
-    option::IndexerOpts,
+    options::IndexerOpts,
 };
 
 #[derive(Serialize, Deserialize, Debug)]
diff --git a/meilisearch-http/src/index_controller/dump_actor/loaders/v2.rs b/meilisearch-lib/src/index_controller/dump_actor/loaders/v2.rs
similarity index 97%
rename from meilisearch-http/src/index_controller/dump_actor/loaders/v2.rs
rename to meilisearch-lib/src/index_controller/dump_actor/loaders/v2.rs
index eddd8a3b7..c39da1e44 100644
--- a/meilisearch-http/src/index_controller/dump_actor/loaders/v2.rs
+++ b/meilisearch-lib/src/index_controller/dump_actor/loaders/v2.rs
@@ -6,7 +6,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::index::Index;
 use crate::index_controller::{update_actor::UpdateStore, uuid_resolver::HeedUuidStore};
-use crate::option::IndexerOpts;
+use crate::options::IndexerOpts;
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
diff --git a/meilisearch-http/src/index_controller/dump_actor/message.rs b/meilisearch-lib/src/index_controller/dump_actor/message.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/dump_actor/message.rs
rename to meilisearch-lib/src/index_controller/dump_actor/message.rs
diff --git a/meilisearch-http/src/index_controller/dump_actor/mod.rs b/meilisearch-lib/src/index_controller/dump_actor/mod.rs
similarity index 96%
rename from meilisearch-http/src/index_controller/dump_actor/mod.rs
rename to meilisearch-lib/src/index_controller/dump_actor/mod.rs
index c8aad6815..e0f9535f3 100644
--- a/meilisearch-http/src/index_controller/dump_actor/mod.rs
+++ b/meilisearch-lib/src/index_controller/dump_actor/mod.rs
@@ -18,7 +18,7 @@ pub use message::DumpMsg;
 
 use super::{update_actor::UpdateActorHandle, uuid_resolver::UuidResolverHandle};
 use crate::index_controller::dump_actor::error::DumpActorError;
-use crate::{helpers::compression, option::IndexerOpts};
+use crate::options::IndexerOpts;
 use error::Result;
 
 mod actor;
@@ -112,7 +112,7 @@ pub fn load_dump(
     let tmp_src = tempfile::tempdir_in(".")?;
     let tmp_src_path = tmp_src.path();
 
-    compression::from_tar_gz(&src_path, tmp_src_path)?;
+    crate::from_tar_gz(&src_path, tmp_src_path)?;
 
     let meta_path = tmp_src_path.join(META_FILE_NAME);
     let mut meta_file = File::open(&meta_path)?;
@@ -162,6 +162,7 @@ impl<U, P> DumpTask<U, P>
 where
     U: UuidResolverHandle + Send + Sync + Clone + 'static,
     P: UpdateActorHandle + Send + Sync + Clone + 'static,
+
 {
     async fn run(self) -> Result<()> {
         trace!("Performing dump.");
@@ -186,7 +187,7 @@ where
 
         let dump_path = tokio::task::spawn_blocking(move || -> Result<PathBuf> {
             let temp_dump_file = tempfile::NamedTempFile::new_in(&self.path)?;
-            compression::to_tar_gz(temp_dump_path, temp_dump_file.path())
+            crate::to_tar_gz(temp_dump_path, temp_dump_file.path())
                 .map_err(|e| DumpActorError::Internal(e.into()))?;
 
             let dump_path = self.path.join(self.uid).with_extension("dump");
diff --git a/meilisearch-http/src/index_controller/error.rs b/meilisearch-lib/src/index_controller/error.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/error.rs
rename to meilisearch-lib/src/index_controller/error.rs
diff --git a/meilisearch-http/src/index_controller/index_actor/actor.rs b/meilisearch-lib/src/index_controller/index_actor/actor.rs
similarity index 99%
rename from meilisearch-http/src/index_controller/index_actor/actor.rs
rename to meilisearch-lib/src/index_controller/index_actor/actor.rs
index abc08788e..cee656b97 100644
--- a/meilisearch-http/src/index_controller/index_actor/actor.rs
+++ b/meilisearch-lib/src/index_controller/index_actor/actor.rs
@@ -16,7 +16,7 @@ use crate::index::{
 use crate::index_controller::{
     get_arc_ownership_blocking, Failed, IndexStats, Processed, Processing,
 };
-use crate::option::IndexerOpts;
+use crate::options::IndexerOpts;
 
 use super::error::{IndexActorError, Result};
 use super::{IndexMeta, IndexMsg, IndexSettings, IndexStore};
@@ -29,7 +29,9 @@ pub struct IndexActor<S> {
     store: S,
 }
 
-impl<S: IndexStore + Sync + Send> IndexActor<S> {
+impl<S> IndexActor<S>
+where S: IndexStore + Sync + Send,
+{
     pub fn new(
         receiver: mpsc::Receiver<IndexMsg>,
         store: S,
diff --git a/meilisearch-http/src/index_controller/index_actor/error.rs b/meilisearch-lib/src/index_controller/index_actor/error.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/index_actor/error.rs
rename to meilisearch-lib/src/index_controller/index_actor/error.rs
diff --git a/meilisearch-http/src/index_controller/index_actor/handle_impl.rs b/meilisearch-lib/src/index_controller/index_actor/handle_impl.rs
similarity index 99%
rename from meilisearch-http/src/index_controller/index_actor/handle_impl.rs
rename to meilisearch-lib/src/index_controller/index_actor/handle_impl.rs
index efc104c54..8cc66edee 100644
--- a/meilisearch-http/src/index_controller/index_actor/handle_impl.rs
+++ b/meilisearch-lib/src/index_controller/index_actor/handle_impl.rs
@@ -1,4 +1,4 @@
-use crate::option::IndexerOpts;
+use crate::options::IndexerOpts;
 use std::path::{Path, PathBuf};
 
 use tokio::sync::{mpsc, oneshot};
diff --git a/meilisearch-http/src/index_controller/index_actor/message.rs b/meilisearch-lib/src/index_controller/index_actor/message.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/index_actor/message.rs
rename to meilisearch-lib/src/index_controller/index_actor/message.rs
diff --git a/meilisearch-http/src/index_controller/index_actor/mod.rs b/meilisearch-lib/src/index_controller/index_actor/mod.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/index_actor/mod.rs
rename to meilisearch-lib/src/index_controller/index_actor/mod.rs
diff --git a/meilisearch-http/src/index_controller/index_actor/store.rs b/meilisearch-lib/src/index_controller/index_actor/store.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/index_actor/store.rs
rename to meilisearch-lib/src/index_controller/index_actor/store.rs
diff --git a/meilisearch-http/src/index_controller/mod.rs b/meilisearch-lib/src/index_controller/mod.rs
similarity index 82%
rename from meilisearch-http/src/index_controller/mod.rs
rename to meilisearch-lib/src/index_controller/mod.rs
index 88a219530..73df4eee6 100644
--- a/meilisearch-http/src/index_controller/mod.rs
+++ b/meilisearch-lib/src/index_controller/mod.rs
@@ -22,8 +22,8 @@ use update_actor::UpdateActorHandle;
 pub use updates::*;
 use uuid_resolver::{error::UuidResolverError, UuidResolverHandle};
 
+use crate::options::IndexerOpts;
 use crate::index::{Checked, Document, SearchQuery, SearchResult, Settings};
-use crate::option::Opt;
 use error::Result;
 
 use self::dump_actor::load_dump;
@@ -99,45 +99,58 @@ pub enum Update {
     }
 }
 
-impl IndexController {
-    pub fn new(path: impl AsRef<Path>, options: &Opt) -> anyhow::Result<Self> {
-        let index_size = options.max_index_size.get_bytes() as usize;
-        let update_store_size = options.max_index_size.get_bytes() as usize;
+#[derive(Default, Debug)]
+pub struct IndexControllerBuilder {
+    max_index_size: Option<usize>,
+    max_update_store_size: Option<usize>,
+    snapshot_dir: Option<PathBuf>,
+    import_snapshot: Option<PathBuf>,
+    ignore_snapshot_if_db_exists: bool,
+    ignore_missing_snapshot: bool,
+    dump_src: Option<PathBuf>,
+    dump_dst: Option<PathBuf>,
+}
 
-        if let Some(ref path) = options.import_snapshot {
+impl IndexControllerBuilder {
+    pub fn build(self, db_path: impl AsRef<Path>, indexer_options: IndexerOpts) -> anyhow::Result<IndexController> {
+        let index_size = self.max_index_size.ok_or_else(|| anyhow::anyhow!("Missing index size"))?;
+        let update_store_size = self.max_index_size.ok_or_else(|| anyhow::anyhow!("Missing update database size"))?;
+
+        if let Some(ref path) = self.import_snapshot {
             info!("Loading from snapshot {:?}", path);
             load_snapshot(
-                &options.db_path,
+                db_path.as_ref(),
                 path,
-                options.ignore_snapshot_if_db_exists,
-                options.ignore_missing_snapshot,
+                self.ignore_snapshot_if_db_exists,
+                self.ignore_missing_snapshot,
             )?;
-        } else if let Some(ref src_path) = options.import_dump {
+        } else if let Some(ref src_path) = self.dump_src {
             load_dump(
-                &options.db_path,
+                db_path.as_ref(),
                 src_path,
-                options.max_index_size.get_bytes() as usize,
-                options.max_udb_size.get_bytes() as usize,
-                &options.indexer_options,
+                index_size,
+                update_store_size,
+                &indexer_options,
             )?;
         }
 
-        std::fs::create_dir_all(&path)?;
+        std::fs::create_dir_all(db_path.as_ref())?;
 
-        let uuid_resolver = uuid_resolver::UuidResolverHandleImpl::new(&path)?;
+        let uuid_resolver = uuid_resolver::UuidResolverHandleImpl::new(&db_path)?;
         let index_handle =
-            index_actor::IndexActorHandleImpl::new(&path, index_size, &options.indexer_options)?;
+            index_actor::IndexActorHandleImpl::new(&db_path, index_size, &indexer_options)?;
         let update_handle = update_actor::UpdateActorHandleImpl::new(
             index_handle.clone(),
-            &path,
+            &db_path,
             update_store_size,
         )?;
+
         let dump_handle = dump_actor::DumpActorHandleImpl::new(
-            &options.dumps_dir,
+            &self.dump_dst.ok_or_else(|| anyhow::anyhow!("Missing dump directory path"))?,
             uuid_resolver.clone(),
             update_handle.clone(),
-            options.max_index_size.get_bytes() as usize,
-            options.max_udb_size.get_bytes() as usize,
+            index_size,
+            update_store_size,
         )?;
 
         //if options.schedule_snapshot {
@@ -156,7 +169,7 @@ impl IndexController {
             //tokio::task::spawn(snapshot_service.run());
         //}
 
-        Ok(Self {
+        Ok(IndexController {
             uuid_resolver,
             index_handle,
             update_handle,
@@ -164,6 +177,59 @@ impl IndexController {
         })
     }
 
+    /// Set the index controller builder's max update store size.
+    pub fn set_max_update_store_size(&mut self, max_update_store_size: usize) -> &mut Self {
+        self.max_update_store_size.replace(max_update_store_size);
+        self
+    }
+
+    pub fn set_max_index_size(&mut self, size: usize) -> &mut Self {
+        self.max_index_size.replace(size);
+        self
+    }
+
+    /// Set the index controller builder's snapshot path.
+    pub fn set_snapshot_dir(&mut self, snapshot_dir: PathBuf) -> &mut Self {
+        self.snapshot_dir.replace(snapshot_dir);
+        self
+    }
+
+    /// Set the index controller builder's ignore snapshot if db exists.
+    pub fn set_ignore_snapshot_if_db_exists(&mut self, ignore_snapshot_if_db_exists: bool) -> &mut Self {
+        self.ignore_snapshot_if_db_exists = ignore_snapshot_if_db_exists;
+        self
+    }
+
+    /// Set the index controller builder's ignore missing snapshot.
+    pub fn set_ignore_missing_snapshot(&mut self, ignore_missing_snapshot: bool) -> &mut Self {
+        self.ignore_missing_snapshot = ignore_missing_snapshot;
+        self
+    }
+
+    /// Set the index controller builder's dump src.
+    pub fn set_dump_src(&mut self, dump_src: PathBuf) -> &mut Self {
+        self.dump_src.replace(dump_src);
+        self
+    }
+
+    /// Set the index controller builder's dump dst.
+    pub fn set_dump_dst(&mut self, dump_dst: PathBuf) -> &mut Self {
+        self.dump_dst.replace(dump_dst);
+        self
+    }
+
+    /// Set the index controller builder's import snapshot.
+    pub fn set_import_snapshot(&mut self, import_snapshot: PathBuf) -> &mut Self {
+        self.import_snapshot.replace(import_snapshot);
+        self
+    }
+}
+
+impl IndexController {
+    pub fn builder() -> IndexControllerBuilder {
+        IndexControllerBuilder::default()
+    }
+
     pub async fn register_update(&self, uid: &str, update: Update) -> Result<UpdateStatus> {
         match self.uuid_resolver.get(uid.to_string()).await {
             Ok(uuid) => {
diff --git a/meilisearch-http/src/index_controller/snapshot.rs b/meilisearch-lib/src/index_controller/snapshot.rs
similarity index 98%
rename from meilisearch-http/src/index_controller/snapshot.rs
rename to meilisearch-lib/src/index_controller/snapshot.rs
index 6c5171d62..c2f600bbc 100644
--- a/meilisearch-http/src/index_controller/snapshot.rs
+++ b/meilisearch-lib/src/index_controller/snapshot.rs
@@ -2,8 +2,6 @@ use std::path::Path;
 
 use anyhow::bail;
 
-use crate::helpers::compression;
-
 //pub struct SnapshotService<U, R> {
     //uuid_resolver_handle: R,
     //update_handle: U,
@@ -93,7 +91,7 @@ pub fn load_snapshot(
     ignore_missing_snapshot: bool,
 ) -> anyhow::Result<()> {
     if !db_path.as_ref().exists() && snapshot_path.as_ref().exists() {
-        match compression::from_tar_gz(snapshot_path, &db_path) {
+        match crate::from_tar_gz(snapshot_path, &db_path) {
             Ok(()) => Ok(()),
             Err(e) => {
                 // clean created db folder
diff --git a/meilisearch-http/src/index_controller/update_actor/actor.rs b/meilisearch-lib/src/index_controller/update_actor/actor.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/update_actor/actor.rs
rename to meilisearch-lib/src/index_controller/update_actor/actor.rs
diff --git a/meilisearch-http/src/index_controller/update_actor/error.rs b/meilisearch-lib/src/index_controller/update_actor/error.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/update_actor/error.rs
rename to meilisearch-lib/src/index_controller/update_actor/error.rs
diff --git a/meilisearch-http/src/index_controller/update_actor/handle_impl.rs b/meilisearch-lib/src/index_controller/update_actor/handle_impl.rs
similarity index 99%
rename from meilisearch-http/src/index_controller/update_actor/handle_impl.rs
rename to meilisearch-lib/src/index_controller/update_actor/handle_impl.rs
index 5175f2eb5..e1df0b5d4 100644
--- a/meilisearch-http/src/index_controller/update_actor/handle_impl.rs
+++ b/meilisearch-lib/src/index_controller/update_actor/handle_impl.rs
@@ -41,6 +41,7 @@ impl UpdateActorHandle for UpdateActorHandleImpl {
         self.sender.send(msg).await?;
         receiver.await?
     }
+
     async fn update_status(&self, uuid: Uuid, id: u64) -> Result<UpdateStatus> {
         let (ret, receiver) = oneshot::channel();
         let msg = UpdateMsg::GetUpdate { uuid, id, ret };
diff --git a/meilisearch-http/src/index_controller/update_actor/message.rs b/meilisearch-lib/src/index_controller/update_actor/message.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/update_actor/message.rs
rename to meilisearch-lib/src/index_controller/update_actor/message.rs
diff --git a/meilisearch-http/src/index_controller/update_actor/mod.rs b/meilisearch-lib/src/index_controller/update_actor/mod.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/update_actor/mod.rs
rename to meilisearch-lib/src/index_controller/update_actor/mod.rs
diff --git a/meilisearch-http/src/index_controller/update_actor/store/codec.rs b/meilisearch-lib/src/index_controller/update_actor/store/codec.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/update_actor/store/codec.rs
rename to meilisearch-lib/src/index_controller/update_actor/store/codec.rs
diff --git a/meilisearch-http/src/index_controller/update_actor/store/dump.rs b/meilisearch-lib/src/index_controller/update_actor/store/dump.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/update_actor/store/dump.rs
rename to meilisearch-lib/src/index_controller/update_actor/store/dump.rs
diff --git a/meilisearch-http/src/index_controller/update_actor/store/mod.rs b/meilisearch-lib/src/index_controller/update_actor/store/mod.rs
similarity index 99%
rename from meilisearch-http/src/index_controller/update_actor/store/mod.rs
rename to meilisearch-lib/src/index_controller/update_actor/store/mod.rs
index 2dd758b82..62fcbd5ad 100644
--- a/meilisearch-http/src/index_controller/update_actor/store/mod.rs
+++ b/meilisearch-lib/src/index_controller/update_actor/store/mod.rs
@@ -28,7 +28,7 @@ use codec::*;
 
 use super::RegisterUpdate;
 use super::error::Result;
-use crate::helpers::EnvSizer;
+use crate::EnvSizer;
 use crate::index_controller::update_files_path;
 use crate::index_controller::{index_actor::CONCURRENT_INDEX_MSG, updates::*, IndexActorHandle};
 
@@ -323,7 +323,7 @@ impl UpdateStore {
         let result =
             match handle.block_on(index_handle.update(index_uuid, processing.clone())) {
                 Ok(result) => result,
-                Err(e) => Err(processing.fail(e.into())),
+                Err(e) => Err(processing.fail(e)),
             };
 
         // Once the pending update have been successfully processed
diff --git a/meilisearch-http/src/index_controller/update_file_store.rs b/meilisearch-lib/src/index_controller/update_file_store.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/update_file_store.rs
rename to meilisearch-lib/src/index_controller/update_file_store.rs
diff --git a/meilisearch-http/src/index_controller/updates.rs b/meilisearch-lib/src/index_controller/updates.rs
similarity index 89%
rename from meilisearch-http/src/index_controller/updates.rs
rename to meilisearch-lib/src/index_controller/updates.rs
index 7065b0462..efe48e5e5 100644
--- a/meilisearch-http/src/index_controller/updates.rs
+++ b/meilisearch-lib/src/index_controller/updates.rs
@@ -1,11 +1,12 @@
+use std::{error::Error, fmt::Display};
+
 use chrono::{DateTime, Utc};
+
+use meilisearch_error::{Code, ErrorCode};
 use milli::update::{DocumentAdditionResult, IndexDocumentsMethod};
 use serde::{Deserialize, Serialize};
 
-use crate::{
-    error::ResponseError,
-    index::{Settings, Unchecked},
-};
+use crate::index::{Settings, Unchecked};
 
 use super::update_actor::RegisterUpdate;
 
@@ -115,10 +116,13 @@ impl Processing {
         }
     }
 
-    pub fn fail(self, error: ResponseError) -> Failed {
+    pub fn fail(self, error: impl ErrorCode) -> Failed {
+        let msg = error.to_string();
+        let code = error.error_code();
         Failed {
             from: self,
-            error,
+            msg,
+            code,
             failed_at: Utc::now(),
         }
     }
@@ -147,10 +151,25 @@ impl Aborted {
 pub struct Failed {
     #[serde(flatten)]
     pub from: Processing,
-    pub error: ResponseError,
+    pub msg: String,
+    pub code: Code,
     pub failed_at: DateTime<Utc>,
 }
 
+impl Display for Failed {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.msg.fmt(f)
+    }
+}
+
+impl Error for Failed { }
+
+impl ErrorCode for Failed {
+    fn error_code(&self) -> Code {
+        self.code
+    }
+}
+
 impl Failed {
     pub fn id(&self) -> u64 {
         self.from.id()
diff --git a/meilisearch-http/src/index_controller/uuid_resolver/actor.rs b/meilisearch-lib/src/index_controller/uuid_resolver/actor.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/uuid_resolver/actor.rs
rename to meilisearch-lib/src/index_controller/uuid_resolver/actor.rs
diff --git a/meilisearch-http/src/index_controller/uuid_resolver/error.rs b/meilisearch-lib/src/index_controller/uuid_resolver/error.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/uuid_resolver/error.rs
rename to meilisearch-lib/src/index_controller/uuid_resolver/error.rs
diff --git a/meilisearch-http/src/index_controller/uuid_resolver/handle_impl.rs b/meilisearch-lib/src/index_controller/uuid_resolver/handle_impl.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/uuid_resolver/handle_impl.rs
rename to meilisearch-lib/src/index_controller/uuid_resolver/handle_impl.rs
diff --git a/meilisearch-http/src/index_controller/uuid_resolver/message.rs b/meilisearch-lib/src/index_controller/uuid_resolver/message.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/uuid_resolver/message.rs
rename to meilisearch-lib/src/index_controller/uuid_resolver/message.rs
diff --git a/meilisearch-http/src/index_controller/uuid_resolver/mod.rs b/meilisearch-lib/src/index_controller/uuid_resolver/mod.rs
similarity index 100%
rename from meilisearch-http/src/index_controller/uuid_resolver/mod.rs
rename to meilisearch-lib/src/index_controller/uuid_resolver/mod.rs
diff --git a/meilisearch-http/src/index_controller/uuid_resolver/store.rs b/meilisearch-lib/src/index_controller/uuid_resolver/store.rs
similarity index 99%
rename from meilisearch-http/src/index_controller/uuid_resolver/store.rs
rename to meilisearch-lib/src/index_controller/uuid_resolver/store.rs
index f02d22d7f..5457ab91d 100644
--- a/meilisearch-http/src/index_controller/uuid_resolver/store.rs
+++ b/meilisearch-lib/src/index_controller/uuid_resolver/store.rs
@@ -9,7 +9,7 @@ use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
 use super::{error::UuidResolverError, Result, UUID_STORE_SIZE};
-use crate::helpers::EnvSizer;
+use crate::EnvSizer;
 
 #[derive(Serialize, Deserialize)]
 struct DumpEntry {
diff --git a/meilisearch-lib/src/lib.rs b/meilisearch-lib/src/lib.rs
new file mode 100644
index 000000000..9f6be4361
--- /dev/null
+++ b/meilisearch-lib/src/lib.rs
@@ -0,0 +1,53 @@
+#[macro_use]
+pub mod error;
+pub mod options;
+
+pub mod index;
+pub mod index_controller;
+
+pub use index_controller::{UpdateResult, UpdateStatus, IndexController as MeiliSearch, update_actor::RegisterUpdate};
+
+use walkdir::WalkDir;
+
+pub trait EnvSizer {
+    fn size(&self) -> u64;
+}
+
+impl EnvSizer for heed::Env {
+    fn size(&self) -> u64 {
+        WalkDir::new(self.path())
+            .into_iter()
+            .filter_map(|entry| entry.ok())
+            .filter_map(|entry| entry.metadata().ok())
+            .filter(|metadata| metadata.is_file())
+            .fold(0, |acc, m| acc + m.len())
+    }
+}
+
+use std::fs::{create_dir_all, File};
+use std::io::Write;
+use std::path::Path;
+
+use flate2::{read::GzDecoder, write::GzEncoder, Compression};
+use tar::{Archive, Builder};
+
+pub fn to_tar_gz(src: impl AsRef<Path>, dest: impl AsRef<Path>) -> anyhow::Result<()> {
+    let mut f = File::create(dest)?;
+    let gz_encoder = GzEncoder::new(&mut f, Compression::default());
+    let mut tar_encoder = Builder::new(gz_encoder);
+    tar_encoder.append_dir_all(".", src)?;
+    let gz_encoder = tar_encoder.into_inner()?;
+    gz_encoder.finish()?;
+    f.flush()?;
+    Ok(())
+}
+
+pub fn from_tar_gz(src: impl AsRef<Path>, dest: impl AsRef<Path>) -> anyhow::Result<()> {
+    let f = File::open(&src)?;
+    let gz = GzDecoder::new(f);
+    let mut ar = Archive::new(gz);
+    create_dir_all(&dest)?;
+    ar.unpack(&dest)?;
+    Ok(())
+}
+
diff --git a/meilisearch-lib/src/options.rs b/meilisearch-lib/src/options.rs
new file mode 100644
index 000000000..f4b992f2e
--- /dev/null
+++ b/meilisearch-lib/src/options.rs
@@ -0,0 +1,115 @@
+use core::fmt;
+use std::{ops::Deref, str::FromStr};
+
+use byte_unit::{Byte, ByteError};
+use milli::CompressionType;
+use structopt::StructOpt;
+use sysinfo::{RefreshKind, System, SystemExt};
+
+#[derive(Debug, Clone, StructOpt)]
+pub struct IndexerOpts {
+    /// The amount of documents to skip before printing
+    /// a log regarding the indexing advancement.
+    #[structopt(long, default_value = "100000")] // 100k
+    pub log_every_n: usize,
+
+    /// Grenad max number of chunks in bytes.
+    #[structopt(long)]
+    pub max_nb_chunks: Option<usize>,
+
+    /// The maximum amount of memory the indexer will use. It defaults to 2/3
+    /// of the available memory. It is recommended to use something like 80%-90%
+    /// of the available memory, no more.
+    ///
+    /// In case the engine is unable to retrieve the available memory the engine will
+    /// try to use the memory it needs but without real limit, this can lead to
+    /// Out-Of-Memory issues and it is recommended to specify the amount of memory to use.
+    #[structopt(long, default_value)]
+    pub max_memory: MaxMemory,
+
+    /// The name of the compression algorithm to use when compressing intermediate
+    /// Grenad chunks while indexing documents.
+    ///
+    /// Choosing a fast algorithm will make the indexing faster but may consume more memory.
+    #[structopt(long, default_value = "snappy", possible_values = &["snappy", "zlib", "lz4", "lz4hc", "zstd"])]
+    pub chunk_compression_type: CompressionType,
+
+    /// The level of compression of the chosen algorithm.
+    #[structopt(long, requires = "chunk-compression-type")]
+    pub chunk_compression_level: Option<u32>,
+
+    /// Number of parallel jobs for indexing, defaults to # of CPUs.
+    #[structopt(long)]
+    pub indexing_jobs: Option<usize>,
+}
+
+impl Default for IndexerOpts {
+    fn default() -> Self {
+        Self {
+            log_every_n: 100_000,
+            max_nb_chunks: None,
+            max_memory: MaxMemory::default(),
+            chunk_compression_type: CompressionType::None,
+            chunk_compression_level: None,
+            indexing_jobs: None,
+        }
+    }
+}
+
+/// A type used to detect the max memory available and use 2/3 of it.
+#[derive(Debug, Clone, Copy)]
+pub struct MaxMemory(Option<Byte>);
+
+impl FromStr for MaxMemory {
+    type Err = ByteError;
+
+    fn from_str(s: &str) -> Result<MaxMemory, ByteError> {
+        Byte::from_str(s).map(Some).map(MaxMemory)
+    }
+}
+
+impl Default for MaxMemory {
+    fn default() -> MaxMemory {
+        MaxMemory(
+            total_memory_bytes()
+                .map(|bytes| bytes * 2 / 3)
+                .map(Byte::from_bytes),
+        )
+    }
+}
+
+impl fmt::Display for MaxMemory {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self.0 {
+            Some(memory) => write!(f, "{}", memory.get_appropriate_unit(true)),
+            None => f.write_str("unknown"),
+        }
+    }
+}
+
+impl Deref for MaxMemory {
+    type Target = Option<Byte>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl MaxMemory {
+    pub fn unlimited() -> Self {
+        Self(None)
+    }
+}
+
+/// Returns the total amount of bytes available or `None` if this system isn't supported.
+fn total_memory_bytes() -> Option<u64> {
+    if System::IS_SUPPORTED {
+        let memory_kind = RefreshKind::new().with_memory();
+        let mut system = System::new_with_specifics(memory_kind);
+        system.refresh_memory();
+        Some(system.total_memory() * 1024) // KiB into bytes
+    } else {
+        None
+    }
+}
+