[javitury]

Performance figures are awesome. Also language support is great.

> Sonic only keeps the N most recently pushed results for a given word

This index discards old entries. This is fine for messages, in which aging items lose relevance. Yet the developer uses it for a help desk, which I think should give equal importance to all items.

In this area I would say the main comperitor is Groonga. It can be integrated into PostgreSQL with the PGroonga extension, and it indexes all of the data. However it consumes way more ram.