I feel like almost anything is better than elastic
postgres full text search kicks its butt
You can now host a relay with search capabilities using ElasticSearch on Relayer, thanks to #[0]:
https://github.com/fiatjaf/relayer/pull/37
Comes with an example at https://github.com/fiatjaf/relayer/tree/50ad9de70bddb8bc3ef002603cf73caf511a5f65/search that you can run or modify.
I feel like almost anything is better than elastic
postgres full text search kicks its butt