cut off = 0.65, top k= 40

index_retriever.py

@@ -16,13 +16,13 @@ def create_query_engine(vector_index):
     try:
         bm25_retriever = BM25Retriever.from_defaults(
             docstore=vector_index.docstore, 
-            similarity_top_k=25  
+            similarity_top_k=20  
         )
         
         vector_retriever = VectorIndexRetriever(
             index=vector_index, 
-            similarity_top_k=50,  
-            similarity_cutoff=0.7
+            similarity_top_k=40,  
+            similarity_cutoff=0.65
         )
         
         hybrid_retriever = QueryFusionRetriever(