@vhf are you aware that mastodon deliberately does not have full text search, because it makes individuals talking about topics immediately in a "public space" on those keywords, and leads directly to harassment? That's why only hashtags are searches: they're opt-in, not automatic or opt-out.
Jusy an FYI that if you continue to grow this search engine, you're going to create a LOT of friction and ill will against you in the community. People are already contemplating domain blocks.