I was referring to an integration between Postgres and an external search system such that the data sync is automated. That was what the parent comment was asking about (I think).
What I really want is an integration between Instantsearch.js, and Postgres.
Typesense has written a custom adapter for Instantsearch & Typesense. I would love to just hook Instantsearch up to directly to my rails all. You could use pg_search to get 90% of the value, with next to no complexity on the backend.