documents = SimpleDirectoryReader(input_dir="India_States_UT").load_data() service_context = ServiceContext.from_defaults(embed_model=embed_model, chunk_size=chunk_size,chunk_overlap=chunk_overlap) index = VectorStoreIndex(documents=documents, service_context=service_context,show_progress=True) index.storage_context.persist(f"index_{chunk_size}_{chunk_overlap}")