Update index_retriever.py

index_retriever.py

@@ -77,7 +77,7 @@ def create_query_engine(vector_index):
         vector_retriever = VectorIndexRetriever(
             index=vector_index, 
             similarity_top_k=50,
-            similarity_cutoff=0.7
+            similarity_cutoff=0.45
         )
         
         hybrid_retriever = QueryFusionRetriever(