Merge #3067

3067: Fix task details serialization r=Kerollmops a=ManyTheFish

# Pull Request

- document addition task details always contain the field `indexedDocuments`
  - value is set to `null` when the task is enqueued or processing
  - value is set to `0` when the task is canceled or failed
- the field `deletedDocuments` of the document deletion task details is set to `0` when the task is canceled or failed
- the field `deletedDocuments` of the document clearAll task details is set to `0` when the task is canceled or failed
- the field `deletedTasks` of the task deletion task details is set to `0` when the task is canceled or failed
- the field `canceledTasks` of the task cancelation task details is set to `0` when the task is canceled or failed

## Related issue
Fixes #3057
Fixes #3058


Co-authored-by: ManyTheFish <many@meilisearch.com>

meilisearch-types/src/tasks.rs

@@ -474,6 +474,27 @@ pub enum Details {
     IndexSwap { swaps: Vec<IndexSwap> },
 }
 
+impl Details {
+    pub fn to_failed(&self) -> Self {
+        let mut details = self.clone();
+        match &mut details {
+            Self::DocumentAdditionOrUpdate { indexed_documents, .. } => {
+                *indexed_documents = Some(0)
+            }
+            Self::DocumentDeletion { deleted_documents, .. } => *deleted_documents = Some(0),
+            Self::ClearAll { deleted_documents } => *deleted_documents = Some(0),
+            Self::TaskCancelation { canceled_tasks, .. } => *canceled_tasks = Some(0),
+            Self::TaskDeletion { deleted_tasks, .. } => *deleted_tasks = Some(0),
+            Self::SettingsUpdate { .. }
+            | Self::IndexInfo { .. }
+            | Self::Dump { .. }
+            | Self::IndexSwap { .. } => (),
+        }
+
+        details
+    }
+}
+
 /// Serialize a `time::Duration` as a best effort ISO 8601 while waiting for
 /// https://github.com/time-rs/time/issues/378.
 /// This code is a port of the old code of time that was removed in 0.2.