diff --git a/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py b/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py
index 6610ea5f53..a0e1335dee 100644
--- a/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py
+++ b/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py
@@ -256,7 +256,7 @@ class OpenSearchVector(BaseVector):
                                 "type": "object",
                                 "properties": {
                                     "doc_id": {"type": "keyword"},  # Map doc_id to keyword type
-                                    "document_id": {"type": "keyword"}
+                                    "document_id": {"type": "keyword"},
                                 },
                             },
                         }