We just deployed a big improvement to the underlying tech that powers semantic search in Discourse in DEV: Re-introduce PG Vector 0.8.0 upgrade by romanrizzi · Pull Request #35233 · discourse/discourse · GitHub.
Can you retry your use case now, it’s already deployed to your site. My expectation is that this will make RAG better without the need for a reranker.
We still want to make the re-ranker widely available, but we are waiting for some upstream changes to land first.