fix for vector_index_strategy

app.py

@@ -218,7 +218,7 @@ vector_store_strategy = ChromaVectorStore(chroma_collection=chroma_collection)
 storage_context_strategy = StorageContext.from_defaults(vector_store=vector_store_strategy)
 vector_index_strategy = VectorStoreIndex([], storage_context=storage_context_strategy, service_context=service_context)
 
-vector_index_strategy.insert_nodes(docAdditionalSamples)
+vector_index_strategy.insert_nodes([strategy1, strategy2, strategy3, strategy4, strategy5])
 
 # setting up metadata
 top_k = 1