I have a RAG app that I'd like to expose an API endpoint which just sends the enriched prompt. I'm assuming that by the point the query_engine has been created, the prompt template has had the context_str and query_str pulled from the index and replaced in the template. Is there any way to get the completed prompt as a string from the query_engine?

Hi all, I'm using LlamaIndex with Weaviate. Is there any way to add documents to an existing index incrementally? Or must the entire index be rebuilt every time? I'm trying to allow people to add data to an existing index, but it just returns "store is read-only" and from what I can tell, LlamaIndex doesn't support updating. Is this the case?