diff --git a/index-scheduler/src/lib.rs b/index-scheduler/src/lib.rs
index 5a150ca93..35caea8ac 100644
--- a/index-scheduler/src/lib.rs
+++ b/index-scheduler/src/lib.rs
@@ -9,16 +9,19 @@ mod utils;
 use batch::Batch;
 pub use error::Error;
 use index::Index;
-use milli::heed::types::{DecodeIgnore, OwnedType, SerdeBincode, Str};
 pub use task::Task;
 use task::{Kind, KindWithContent, Status};
+use time::OffsetDateTime;
+use update_file_store::UpdateFileStore;
 
 use std::collections::hash_map::Entry;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
 use std::{collections::HashMap, sync::RwLock};
 
+use milli::heed::types::{DecodeIgnore, OwnedType, SerdeBincode, Str};
 use milli::heed::{Database, Env, EnvOpenOptions, RoTxn, RwTxn};
+use milli::update::IndexDocumentsMethod;
 use milli::{RoaringBitmapCodec, BEU32};
 use roaring::RoaringBitmap;
 use serde::Deserialize;
@@ -54,6 +57,8 @@ pub struct IndexScheduler {
     /// The list of tasks currently processing.
     processing_tasks: Arc<RwLock<RoaringBitmap>>,
 
+    file_store: UpdateFileStore,
+
     /// The LMDB environment which the DBs are associated with.
     env: Env,
 
@@ -326,7 +331,66 @@ impl IndexScheduler {
             Batch::Cancel(_) => todo!(),
             Batch::Snapshot(_) => todo!(),
             Batch::Dump(_) => todo!(),
-            Batch::Contiguous { tasks, kind } => todo!(),
+            Batch::Contiguous { tasks, kind } => {
+                // it's safe because you can't batch 0 contiguous tasks.
+                let first_task = &tasks[0];
+                // and the two kind of tasks we batch MUST have ONE index name.
+                let index_name = first_task.indexes().unwrap()[0];
+                let index = self.index(index_name)?;
+
+                match kind {
+                    Kind::DocumentAddition => {
+                        let content_files = tasks.iter().map(|task| match &task.kind {
+                            KindWithContent::DocumentAddition { content_file, .. } => {
+                                content_file.clone()
+                            }
+                            k => unreachable!(
+                                "Internal error, `{:?}` is not supposed to be reachable here",
+                                k.as_kind()
+                            ),
+                        });
+                        let results = index.update_documents(
+                            IndexDocumentsMethod::UpdateDocuments,
+                            None,
+                            self.file_store.clone(),
+                            content_files,
+                        )?;
+
+                        for (task, result) in tasks.iter_mut().zip(results) {
+                            task.finished_at = Some(OffsetDateTime::now_utc());
+                            match result {
+                                Ok(_) => task.status = Status::Succeeded,
+                                Err(_) => task.status = Status::Succeeded,
+                            }
+                        }
+                    }
+                    Kind::DocumentDeletion => {
+                        let ids: Vec<_> = tasks
+                            .iter()
+                            .flat_map(|task| match &task.kind {
+                                KindWithContent::DocumentDeletion { documents_ids, .. } => {
+                                    documents_ids.clone()
+                                }
+                                k => unreachable!(
+                                    "Internal error, `{:?}` is not supposed to be reachable here",
+                                    k.as_kind()
+                                ),
+                            })
+                            .collect();
+
+                        let result = index.delete_documents(&ids);
+
+                        for task in tasks.iter_mut() {
+                            task.finished_at = Some(OffsetDateTime::now_utc());
+                            match result {
+                                Ok(_) => task.status = Status::Succeeded,
+                                Err(_) => task.status = Status::Succeeded,
+                            }
+                        }
+                    }
+                    _ => unreachable!(),
+                }
+            }
             Batch::Empty => todo!(),
         }
 
diff --git a/index-scheduler/src/task.rs b/index-scheduler/src/task.rs
index de14afcf6..3fdc1c2c3 100644
--- a/index-scheduler/src/task.rs
+++ b/index-scheduler/src/task.rs
@@ -2,6 +2,7 @@ use anyhow::Result;
 use serde::{Deserialize, Serialize};
 use std::path::PathBuf;
 use time::OffsetDateTime;
+use uuid::Uuid;
 
 use crate::TaskId;
 
@@ -56,7 +57,7 @@ pub enum KindWithContent {
     Snapshot,
     DocumentAddition {
         index_name: String,
-        content_file: String,
+        content_file: Uuid,
     },
     DocumentDeletion {
         index_name: String,