One thing to _always_ dig into is how your hybrid search solution filters the vector search index. This is not at all standardized, often overlooked, but when you want "top X most similar to query by embedding, but also in Y category/match Z search terms" its the core operation your hybrid search is doing

Here's a rollup of algorithms... https://bsky.app/profile/softwaredoug.bsky.social/post/3lmrm...