✨(backend) some refactor of indexer classes & modules

Rename FindDocumentIndexer as SearchIndexer
Rename FindDocumentSerializer as SearchDocumentSerializer
Rename package core.tasks.find as core.task.search
Remove logs on http errors in SearchIndexer
Factorise some code in search API view.

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.find import trigger_document_indexer
+from .tasks.search import trigger_document_indexer
 
 
 @receiver(signals.post_save, sender=models.Document)