Hi! Maybe this question is stupid... but

Hi! Maybe this question is stupid... but imagine i have 200 docs and i want to make a RAG to retrieve the documents where an specific topic is talked about. Imagine i have 200 documents abouts cars, but in only 20 of those they talk about ferraris.
I would like to do something like document comparison but at large scale. how can i do this? I would like to do something like analytics of documents with rag. I though about this (https://docs.llamaindex.ai/en/stable/examples/agent/agent_runner/agent_around_query_pipeline_with_HyDE_for_PDFs/ and https://docs.llamaindex.ai/en/stable/examples/agent/multi_document_agents/ )

but I would like to know if someone has already worked on this topic. Thanks.