p90 for a full-text search on 330 million documents was 15ms?
I know you can tune the hell out of search performance, but that seems a bit too insane for what looks like a relatively unspecialized setup (Standard DB).
Not likely the full book, just title, author and a few other low cardinality fields I'm sure. Also not likely 330 million unique volumes, but total books. This is within reach of a single database with proper indexing.
