[D] What are some good IR models for RAG on really noisy industry data?

I tried Keyword based searching, SBert - both performed poorly. Mine is a IR based subset selection task. So more often than not, the retrieved subset is not complete. It misses some elements.

Can LLM be used for IR?

Any suggestions would be helpful. TIA :)

data good industry llm machinelearning mine rag sbert searching suggestions