deepset-ai#1047 Remove count_documents from delete_documents

Removed the expensive check to see if the collection is non-empty by performing a full count.

This is to fix issue deepset-ai#1047

integrations/astra/src/haystack_integrations/document_stores/astra/document_store.py

@@ -412,16 +412,13 @@ def delete_documents(self, document_ids: Optional[List[str]] = None, delete_all:
         :raises MissingDocumentError: if no document was deleted but document IDs were provided.
         """
         deletion_counter = 0
-        if self.index.count_documents() > 0:
-            if document_ids is not None:
-                for batch in _batches(document_ids, MAX_BATCH_SIZE):
-                    deletion_counter += self.index.delete(ids=batch)
-            else:
-                deletion_counter = self.index.delete(delete_all=delete_all)
-            logger.info(f"{deletion_counter} documents deleted")
-
-            if document_ids is not None and deletion_counter == 0:
-                msg = f"Document {document_ids} does not exist"
-                raise MissingDocumentError(msg)
+        if document_ids is not None:
+            for batch in _batches(document_ids, MAX_BATCH_SIZE):
+                deletion_counter += self.index.delete(ids=batch)
         else:
-            logger.info("No documents in document store")
+            deletion_counter = self.index.delete(delete_all=delete_all)
+        logger.info(f"{deletion_counter} documents deleted")
+
+        if document_ids is not None and deletion_counter == 0:
+            msg = f"Document {document_ids} does not exist"
+            raise MissingDocumentError(msg)