Implement OpensearchVectorStore document deletion (#11292)

llama-index-integrations/vector_stores/llama-index-vector-stores-opensearch/llama_index/vector_stores/opensearch/base.py

@@ -350,7 +350,8 @@ class OpensearchVectorClient:
         Args:
             doc_id (str): document id
         """
-        self._os_client.delete(index=self._index, id=doc_id)
+        body = {"query": {"match": {"metadata.ref_doc_id": doc_id}}}
+        self._os_client.delete_by_query(index=self._index, body=body)
 
     def query(
         self,