text: langchain.indexes import VectorstoreIndexCreatorloader = ApifyDatasetLoader(    dataset_id="your-dataset-id",    dataset_mapping_function=lambda item: Document(        page_content=item["text"] or "", metadata={"source": item["url"]}    ),)index = VectorstoreIndexCreator().from_loaders([loader])query = "What is Apify?"result = index.query_with_sources(query)print(result["answer"])print(result["sources"])     Apify is a platform for developing, running, and sharing serverless cloud programs. It enables users to create web scraping and automation tools and publish them on the Apify platform.        https://docs.apify.com/platform/actors, https://docs.apify.com/platform/actors/running/actors-in-store, https://docs.apify.com/platform/security, https://docs.apify.com/platform/actors/examplesPreviousAlibaba Cloud MaxComputeNextArxivPrerequisitesAn example with question answeringCommunityDiscordTwitterGitHubPythonJS/TSMoreHomepageBlogCopyright Â© 2023 LangChain, Inc.