add document lock for multi-thread (#9873)

api/services/dataset_service.py

@@ -760,6 +760,8 @@ class DocumentService:
                     )
                 db.session.add(dataset_process_rule)
                 db.session.commit()
+            lock_name = "add_document_lock_dataset_id_{}".format(dataset.id)
+            with redis_client.lock(lock_name, timeout=600):
                 position = DocumentService.get_documents_position(dataset.id)
                 document_ids = []
                 duplicate_document_ids = []