diff --git a/meilisearch-lib/src/index_resolver/mod.rs b/meilisearch-lib/src/index_resolver/mod.rs
index 19ba051fe..97265e509 100644
--- a/meilisearch-lib/src/index_resolver/mod.rs
+++ b/meilisearch-lib/src/index_resolver/mod.rs
@@ -265,7 +265,7 @@ mod real {
             Ok(())
         }
 
-        pub async fn process_task(&self, task: &Task) -> Result<TaskResult> {
+        async fn process_task_inner(&self, task: &Task) -> Result<TaskResult> {
             match &task.content {
                 TaskContent::DocumentAddition { .. } => {
                     panic!("updates should be handled by batch")
@@ -354,6 +354,13 @@ mod real {
             }
         }
 
+        pub async fn process_task(&self, task: &mut Task) {
+            match self.process_task_inner(&task).await {
+                Ok(res) => task.events.push(TaskEvent::succeeded(res)),
+                Err(e) => task.events.push(TaskEvent::failed(e)),
+            }
+        }
+
         pub async fn dump(&self, path: impl AsRef<Path>) -> Result<()> {
             for (_, index) in self.list().await? {
                 index.dump(&path)?;
@@ -511,110 +518,7 @@ mod test {
             }
         }
 
-        pub async fn process_task(&self, task: &Task) -> Result<TaskResult> {
-            match self {
-                IndexResolver::Real(r) => r.process_task(task).await,
-                IndexResolver::Mock(m) => unsafe { m.get("process_task").call(task) },
-            }
-        }
-
-        pub async fn dump(&self, path: impl AsRef<Path>) -> Result<()> {
-            match self {
-                IndexResolver::Real(r) => r.dump(path).await,
-                IndexResolver::Mock(_) => todo!(),
-            }
-        }
-
-        /// Get or create an index with name `uid`.
-        pub async fn get_or_create_index(&self, uid: IndexUid, task_id: TaskId) -> Result<Index> {
-            match self {
-                IndexResolver::Real(r) => r.get_or_create_index(uid, task_id).await,
-                IndexResolver::Mock(_) => todo!(),
-            }
-        }
-
-        pub async fn list(&self) -> Result<Vec<(String, Index)>> {
-            match self {
-                IndexResolver::Real(r) => r.list().await,
-                IndexResolver::Mock(_) => todo!(),
-            }
-        }
-
-        pub async fn delete_index(&self, uid: String) -> Result<Index> {
-            match self {
-                IndexResolver::Real(r) => r.delete_index(uid).await,
-                IndexResolver::Mock(_) => todo!(),
-            }
-        }
-
-        pub async fn get_index(&self, uid: String) -> Result<Index> {
-            match self {
-                IndexResolver::Real(r) => r.get_index(uid).await,
-                IndexResolver::Mock(_) => todo!(),
-            }
-        }
-
-        pub async fn get_index_creation_task_id(&self, index_uid: String) -> Result<TaskId> {
-            match self {
-                IndexResolver::Real(r) => r.get_index_creation_task_id(index_uid).await,
-                IndexResolver::Mock(_) => todo!(),
-            }
-        }
-
-        pub async fn delete_content_file(&self, content_uuid: Uuid) -> Result<()> {
-            match self {
-                IndexResolver::Real(r) => r.delete_content_file(content_uuid).await,
-                IndexResolver::Mock(m) => unsafe {
-                    m.get("delete_content_file").call(content_uuid)
-                },
-            }
-        }
-    }
-
-    pub enum MockIndexResolver<U, I> {
-        Real(super::real::IndexResolver<U, I>),
-        Mock(Mocker),
-    }
-
-    impl MockIndexResolver<HeedMetaStore, MapIndexStore> {
-        pub fn load_dump(
-            src: impl AsRef<Path>,
-            dst: impl AsRef<Path>,
-            index_db_size: usize,
-            env: Arc<Env>,
-            indexer_opts: &IndexerOpts,
-        ) -> anyhow::Result<()> {
-            super::real::IndexResolver::load_dump(src, dst, index_db_size, env, indexer_opts)
-        }
-    }
-
-    impl<U, I> MockIndexResolver<U, I>
-    where
-        U: IndexMetaStore,
-        I: IndexStore,
-    {
-        pub fn new(index_uuid_store: U, index_store: I, file_store: UpdateFileStore) -> Self {
-            Self::Real(super::real::IndexResolver {
-                index_uuid_store,
-                index_store,
-                file_store,
-            })
-        }
-
-        pub fn mock(mocker: Mocker) -> Self {
-            Self::Mock(mocker)
-        }
-
-        pub async fn process_document_addition_batch(&self, tasks: Vec<Task>) -> Vec<Task> {
-            match self {
-                IndexResolver::Real(r) => r.process_document_addition_batch(tasks).await,
-                IndexResolver::Mock(m) => unsafe {
-                    m.get("process_document_addition_batch").call(tasks)
-                },
-            }
-        }
-
-        pub async fn process_task(&self, task: &Task) -> Result<TaskResult> {
+        pub async fn process_task(&self, task: &mut Task) {
             match self {
                 IndexResolver::Real(r) => r.process_task(task).await,
                 IndexResolver::Mock(m) => unsafe { m.get("process_task").call(task) },
diff --git a/meilisearch-lib/src/tasks/handlers/dump_handler.rs b/meilisearch-lib/src/tasks/handlers/dump_handler.rs
index c708dadcc..c0833e4c7 100644
--- a/meilisearch-lib/src/tasks/handlers/dump_handler.rs
+++ b/meilisearch-lib/src/tasks/handlers/dump_handler.rs
@@ -27,7 +27,7 @@ where
                             .content
                             .push_event(TaskEvent::succeeded(TaskResult::Other));
                     }
-                    Err(e) => batch.content.push_event(TaskEvent::failed(e.into())),
+                    Err(e) => batch.content.push_event(TaskEvent::failed(e)),
                 }
                 batch
             }
diff --git a/meilisearch-lib/src/tasks/handlers/index_resolver_handler.rs b/meilisearch-lib/src/tasks/handlers/index_resolver_handler.rs
index de624106c..21751cd1c 100644
--- a/meilisearch-lib/src/tasks/handlers/index_resolver_handler.rs
+++ b/meilisearch-lib/src/tasks/handlers/index_resolver_handler.rs
@@ -1,7 +1,6 @@
 use crate::index_resolver::IndexResolver;
 use crate::index_resolver::{index_store::IndexStore, meta_store::IndexMetaStore};
 use crate::tasks::batch::{Batch, BatchContent};
-use crate::tasks::task::TaskEvent;
 use crate::tasks::BatchHandler;
 
 #[async_trait::async_trait]
@@ -24,10 +23,9 @@ where
                     .process_document_addition_batch(std::mem::take(tasks))
                     .await;
             }
-            BatchContent::IndexUpdate(ref mut task) => match self.process_task(task).await {
-                Ok(success) => task.events.push(TaskEvent::succeeded(success)),
-                Err(err) => task.events.push(TaskEvent::failed(err.into())),
-            },
+            BatchContent::IndexUpdate(ref mut task) => {
+                self.process_task(task).await;
+            }
             _ => unreachable!(),
         }
 
@@ -54,7 +52,6 @@ mod test {
     use crate::index_resolver::{
         error::Result as IndexResult, index_store::MockIndexStore, meta_store::MockIndexMetaStore,
     };
-    use crate::tasks::task::TaskResult;
     use crate::tasks::{
         handlers::test::task_to_batch,
         task::{Task, TaskContent},
@@ -181,7 +178,7 @@ mod test {
                     }
                     TaskContent::Dump { .. } => (),
                     _ => {
-                        mocker.when::<&Task, IndexResult<TaskResult>>("process_task").then(|_| Ok(TaskResult::Other));
+                        mocker.when::<&mut Task, ()>("process_task").then(|_| ());
                     }
                 }
                 let index_resolver: IndexResolver<HeedMetaStore, MapIndexStore> = IndexResolver::mock(mocker);
diff --git a/meilisearch-lib/src/tasks/task.rs b/meilisearch-lib/src/tasks/task.rs
index f19f6cbfe..cf9ab0520 100644
--- a/meilisearch-lib/src/tasks/task.rs
+++ b/meilisearch-lib/src/tasks/task.rs
@@ -68,9 +68,9 @@ impl TaskEvent {
         }
     }
 
-    pub fn failed(error: ResponseError) -> Self {
+    pub fn failed(error: impl Into<ResponseError>) -> Self {
         Self::Failed {
-            error,
+            error: error.into(),
             timestamp: OffsetDateTime::now_utc(),
         }
     }