FYI, this crunchydata.com blog-post was discussed 11 months ago on HN[0], in a thread awarded 601 points, with 137 comments.
Among other things in that earlier thread, there's some discussion of aspects of ZomboDB with its developer.
ZomboDB is a Postgres extension that enables efficient full-text searching via the use of indexes backed by Elasticsearch. (From the project's website[0]).
Lots more info in readme at the project's github[1].