If someone was to acquire a few hundred gigs of books and feed them to something like paperless-ngx, would it work as a sort of google of books? Are there any software projects better suited for doing thisand understand synonyms and perhaps some context? I guess AI search but guided for the intermediate user.

Google is so bad lately. Basically every result is official sponsored corporate biased BS. It would be nice to be able to instantly query a bunch of ebooks.