added text streamer

backend.py

@@ -78,17 +78,16 @@ def handle_query(query_str, chathistory):
 
     try:
         # Create a streaming query engine
-        query_engine = index.as_query_engine(text_qa_template=text_qa_template, streaming=True)
+        query_engine = index.as_query_engine(text_qa_template=text_qa_template, streaming=True, similarity_top_k=1)
         
         # Execute the query
         streaming_response = query_engine.query(query_str)
         
-        #streaming_response.print_response_stream()
         
         # Stream the response
         outputs = []
         for text in streaming_response.response_gen:
-            outputs.append(text)
+            outputs.append(f"{text}")
             yield "".join(outputs)