diff --git a/meilisearch-http/src/option.rs b/meilisearch-http/src/option.rs
index 7284b4588..9fefb4231 100644
--- a/meilisearch-http/src/option.rs
+++ b/meilisearch-http/src/option.rs
@@ -145,8 +145,8 @@ pub struct Opt {
     #[clap(long, env = "MEILI_LOG_LEVEL", default_value = "info")]
     pub log_level: String,
 
-    #[serde(skip)]
-    #[clap(skip)]
+    #[serde(flatten)]
+    #[clap(flatten)]
     pub indexer_options: IndexerOpts,
 
     #[serde(flatten)]
diff --git a/meilisearch-http/tests/common/server.rs b/meilisearch-http/tests/common/server.rs
index dcb4b6266..8ed106dd3 100644
--- a/meilisearch-http/tests/common/server.rs
+++ b/meilisearch-http/tests/common/server.rs
@@ -152,7 +152,7 @@ pub fn default_settings(dir: impl AsRef<Path>) -> Opt {
         ignore_dump_if_db_exists: false,
         indexer_options: IndexerOpts {
             // memory has to be unlimited because several meilisearch are running in test context.
-            max_memory: MaxMemory::unlimited(),
+            max_indexing_memory: MaxMemory::unlimited(),
             ..Default::default()
         },
         log_level: "off".into(),
diff --git a/meilisearch-lib/src/options.rs b/meilisearch-lib/src/options.rs
index 195576799..bb24d94b0 100644
--- a/meilisearch-lib/src/options.rs
+++ b/meilisearch-lib/src/options.rs
@@ -1,5 +1,5 @@
 use core::fmt;
-use std::{convert::TryFrom, ops::Deref, str::FromStr};
+use std::{convert::TryFrom, num::ParseIntError, ops::Deref, str::FromStr};
 
 use byte_unit::{Byte, ByteError};
 use clap::Parser;
@@ -7,15 +7,17 @@ use milli::{update::IndexerConfig, CompressionType};
 use serde::Serialize;
 use sysinfo::{RefreshKind, System, SystemExt};
 
-#[derive(Debug, Clone, Parser)]
+#[derive(Debug, Clone, Parser, Serialize)]
 pub struct IndexerOpts {
     /// The amount of documents to skip before printing
     /// a log regarding the indexing advancement.
-    #[clap(long, default_value = "100000")] // 100k
+    #[serde(skip)]
+    #[clap(long, default_value = "100000", hide = true)] // 100k
     pub log_every_n: usize,
 
     /// Grenad max number of chunks in bytes.
-    #[clap(long)]
+    #[serde(skip)]
+    #[clap(long, hide = true)]
     pub max_nb_chunks: Option<usize>,
 
     /// The maximum amount of memory the indexer will use. It defaults to 2/3
@@ -25,22 +27,30 @@ pub struct IndexerOpts {
     /// 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.
-    #[clap(long, default_value_t)]
-    pub max_memory: MaxMemory,
+    #[clap(long, env = "MEILI_MAX_INDEXING_MEMORY", default_value_t)]
+    pub max_indexing_memory: MaxMemory,
+
+    /// The maximum number of threads the indexer will use.
+    /// It defaults to half of the available threads.
+    #[clap(long, env = "MEILI_MAX_INDEXING_THREADS", default_value_t)]
+    pub max_indexing_threads: MaxThreads,
 
     /// 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.
-    #[clap(long, default_value = "snappy", possible_values = &["snappy", "zlib", "lz4", "lz4hc", "zstd"])]
+    #[serde(skip)]
+    #[clap(long, default_value = "snappy", possible_values = &["snappy", "zlib", "lz4", "lz4hc", "zstd"], hide = true)]
     pub chunk_compression_type: CompressionType,
 
     /// The level of compression of the chosen algorithm.
-    #[clap(long, requires = "chunk-compression-type")]
+    #[serde(skip)]
+    #[clap(long, requires = "chunk-compression-type", hide = true)]
     pub chunk_compression_level: Option<u32>,
 
     /// Number of parallel jobs for indexing, defaults to # of CPUs.
-    #[clap(long)]
+    #[serde(skip)]
+    #[clap(long, hide = true)]
     pub indexing_jobs: Option<usize>,
 }
 
@@ -74,13 +84,13 @@ impl TryFrom<&IndexerOpts> for IndexerConfig {
 
     fn try_from(other: &IndexerOpts) -> Result<Self, Self::Error> {
         let thread_pool = rayon::ThreadPoolBuilder::new()
-            .num_threads(other.indexing_jobs.unwrap_or(num_cpus::get() / 2))
+            .num_threads(other.indexing_jobs.unwrap_or(*other.max_indexing_threads))
             .build()?;
 
         Ok(Self {
             log_every_n: Some(other.log_every_n),
             max_nb_chunks: other.max_nb_chunks,
-            max_memory: (*other.max_memory).map(|b| b.get_bytes() as usize),
+            max_memory: (*other.max_indexing_memory).map(|b| b.get_bytes() as usize),
             chunk_compression_type: other.chunk_compression_type,
             chunk_compression_level: other.chunk_compression_level,
             thread_pool: Some(thread_pool),
@@ -95,7 +105,8 @@ impl Default for IndexerOpts {
         Self {
             log_every_n: 100_000,
             max_nb_chunks: None,
-            max_memory: MaxMemory::default(),
+            max_indexing_memory: MaxMemory::default(),
+            max_indexing_threads: MaxThreads::default(),
             chunk_compression_type: CompressionType::None,
             chunk_compression_level: None,
             indexing_jobs: None,
@@ -104,7 +115,7 @@ impl Default for IndexerOpts {
 }
 
 /// A type used to detect the max memory available and use 2/3 of it.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Serialize)]
 pub struct MaxMemory(Option<Byte>);
 
 impl FromStr for MaxMemory {
@@ -159,3 +170,34 @@ fn total_memory_bytes() -> Option<u64> {
         None
     }
 }
+
+#[derive(Debug, Clone, Copy, Serialize)]
+pub struct MaxThreads(usize);
+
+impl FromStr for MaxThreads {
+    type Err = ParseIntError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        usize::from_str(s).map(Self)
+    }
+}
+
+impl Default for MaxThreads {
+    fn default() -> Self {
+        MaxThreads(num_cpus::get() / 2)
+    }
+}
+
+impl fmt::Display for MaxThreads {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl Deref for MaxThreads {
+    type Target = usize;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}