Interestingly enough SQLites FTS supports Lucene queries out of the box with great performance characteristics. IIRC only writes become pretty slow after a while.
I’ve always wondered what exactly would prevent PostgreSQL from strapping that implementation into its own database. My experience with ts_query hasn’t been particularly rosy. It can be better than LIKE but only marginally so and at the cost of insane index sizes…
If this extension becomes open source and we can test it out in the real world I’m sure there’s a sweet spot