✨(backend) use batches in indexing task

Reduce the number of Find API calls by grouping all the latest changes
for indexation : send all the documents updated or deleted since the
triggering of the task.

Signed-off-by: Fabre Florian <ffabre@hybird.org>

src/backend/core/signals.py

@@ -9,7 +9,7 @@ from django.db.models import signals
 from django.dispatch import receiver
 
 from . import models
-from .tasks.search import trigger_document_indexer
+from .tasks.search import trigger_batch_document_indexer
 
 
 @receiver(signals.post_save, sender=models.Document)
@@ -19,7 +19,7 @@ def document_post_save(sender, instance, **kwargs):  # pylint: disable=unused-ar
     Note : Within the transaction we can have an empty content and a serialization
     error.
     """
-    transaction.on_commit(partial(trigger_document_indexer, instance))
+    transaction.on_commit(partial(trigger_batch_document_indexer, instance))
 
 
 @receiver(signals.post_save, sender=models.DocumentAccess)
@@ -28,4 +28,6 @@ def document_access_post_save(sender, instance, created, **kwargs):  # pylint: d
     Asynchronous call to the document indexer at the end of the transaction.
     """
     if not created:
-        transaction.on_commit(partial(trigger_document_indexer, instance.document))
+        transaction.on_commit(
+            partial(trigger_batch_document_indexer, instance.document)
+        )