You are aware sqlite includes a full text search engine too?

https://sqlite.org/fts3.html https://sqlite.org/fts5.html

I've been having a lot of fun with the SQLite FTS library. The best public-facing demo I have is probably the search feature on https://datasette.io - e.g. https://datasette.io/-/beta?q=fts- that's powered by my https://github.com/dogsheep/dogsheep-beta tool.

Typesense and Melisearch are what you're looking for.

sqlite is itself a full text search engine. It's gotten pretty good over the years.

https://www.sqlite.org/fts5.html

That's what Apache Lucy tried to become, but it's an abandoned project.

You could try Xapian. Or there's always SQLite itself.