I am trying to use this example (https://gpt-index.readthedocs.io/en/latest/examples/usecases/10k_sub_question.html) with LangChainLLM (https://gpt-index.readthedocs.io/en/latest/reference/llms/langchain.html) - I am not sure where do I pass the LLM name. for example, I am trying to use Bedrock from Langchain (https://python.langchain.com/docs/modules/model_io/models/llms/integrations/bedrock)

I am trying to use this example (https://gpt-index.readthedocs.io/en/latest/examples/usecases/10k_sub_question.html) with LangChainLLM (https://gpt-index.readthedocs.io/en/latest/reference/llms/langchain.html) - I am not sure where do I pass the LLM name. for example, I am trying to use Bedrock from Langchain (https://python.langchain.com/docs/modules/model_io/models/llms/integrations/bedrock)

I am looking to sort VectorIndexRetriever by the rank. I see this. https://gpt-index.readthedocs.io/en/latest/core_modules/query_modules/node_postprocessors/modules.html#fixedrecencypostprocessor but not sure how can I use it

what could the the reason the metadata from the query_engine.query is coming empty? i am getting response fine