Update app.py

app.py

@@ -42,6 +42,8 @@ def initialize_vector_store_index(data_path, service_context):
     # Load the index from a file
     with open('./index_file.pkl', 'rb') as f:
         index = pickle.load(f)
+    index = VectorStoreIndex.from_documents(documents, service_context=service_context)
+
     return index
 
 def main():