diff --git a/pilot/graph_engine/graph_engine.py b/pilot/graph_engine/graph_engine.py
index a50ebabdc..faf53aba1 100644
--- a/pilot/graph_engine/graph_engine.py
+++ b/pilot/graph_engine/graph_engine.py
@@ -129,6 +129,11 @@ class RAGGraphEngine:
                 )
 
         result = [future.result() for future in future_tasks]
+        # for triplet in triplets:
+        #     subj, _, obj = triplet
+        #     self.graph_store.upsert_triplet(*triplet)
+        #     self.graph_store.upsert_triplet(*triplet)
+        #     index_struct.add_node([subj, obj], text_node)
         return index_struct
         # for doc in documents:
         #     triplets = self._extract_triplets(doc.page_content)
@@ -162,8 +167,9 @@ class RAGGraphEngine:
         print(
             f"current thread-{thread_id} end extract triplets tasks, triplets-{triplets}"
         )
-        for triplet in triplets:
-            subj, _, obj = triplet
-            self.graph_store.upsert_triplet(*triplet)
-            self.graph_store.upsert_triplet(*triplet)
-            index_struct.add_node([subj, obj], text_node)
+        return triplets
+        # for triplet in triplets:
+        #     subj, _, obj = triplet
+        #     self.graph_store.upsert_triplet(*triplet)
+        #     self.graph_store.upsert_triplet(*triplet)
+        #     index_struct.add_node([subj, obj], text_node)
diff --git a/pilot/graph_engine/graph_search.py b/pilot/graph_engine/graph_search.py
index d1f6a4519..fb883e48b 100644
--- a/pilot/graph_engine/graph_search.py
+++ b/pilot/graph_engine/graph_search.py
@@ -145,7 +145,7 @@ class RAGGraphSearch(BaseSearch):
             if len(sorted_nodes_with_scores) == 0:
                 logger.info("> No nodes found by keywords, returning empty response.")
             return [
-                NodeWithScore(node=TextNode(text="No relationships found."), score=1.0)
+                Document(page_content="No relationships found.")
             ]
 
         # add relationships as Node