diff --git a/backend/open_webui/retrieval/vector/dbs/elasticsearch.py b/backend/open_webui/retrieval/vector/dbs/elasticsearch.py
index 18a915e381..727d831cff 100644
--- a/backend/open_webui/retrieval/vector/dbs/elasticsearch.py
+++ b/backend/open_webui/retrieval/vector/dbs/elasticsearch.py
@@ -2,6 +2,8 @@ from elasticsearch import Elasticsearch, BadRequestError
 from typing import Optional
 import ssl
 from elasticsearch.helpers import bulk, scan
+
+from open_webui.retrieval.vector.utils import stringify_metadata
 from open_webui.retrieval.vector.main import (
     VectorDBBase,
     VectorItem,
@@ -243,7 +245,7 @@ class ElasticsearchClient(VectorDBBase):
                         "collection": collection_name,
                         "vector": item["vector"],
                         "text": item["text"],
-                        "metadata": item["metadata"],
+                        "metadata": stringify_metadata(item["metadata"]),
                     },
                 }
                 for item in batch
@@ -264,7 +266,7 @@ class ElasticsearchClient(VectorDBBase):
                         "collection": collection_name,
                         "vector": item["vector"],
                         "text": item["text"],
-                        "metadata": item["metadata"],
+                        "metadata": stringify_metadata(item["metadata"]),
                     },
                     "doc_as_upsert": True,
                 }
diff --git a/backend/open_webui/retrieval/vector/dbs/opensearch.py b/backend/open_webui/retrieval/vector/dbs/opensearch.py
index 7e16df3cfb..510070f97a 100644
--- a/backend/open_webui/retrieval/vector/dbs/opensearch.py
+++ b/backend/open_webui/retrieval/vector/dbs/opensearch.py
@@ -2,6 +2,7 @@ from opensearchpy import OpenSearch
 from opensearchpy.helpers import bulk
 from typing import Optional
 
+from open_webui.retrieval.vector.utils import stringify_metadata
 from open_webui.retrieval.vector.main import (
     VectorDBBase,
     VectorItem,
@@ -200,7 +201,7 @@ class OpenSearchClient(VectorDBBase):
                     "_source": {
                         "vector": item["vector"],
                         "text": item["text"],
-                        "metadata": item["metadata"],
+                        "metadata": stringify_metadata(item["metadata"]),
                     },
                 }
                 for item in batch
@@ -222,7 +223,7 @@ class OpenSearchClient(VectorDBBase):
                     "doc": {
                         "vector": item["vector"],
                         "text": item["text"],
-                        "metadata": item["metadata"],
+                        "metadata": stringify_metadata(item["metadata"]),
                     },
                     "doc_as_upsert": True,
                 }