R1:b1703c8801f4

Support Ferret engine in Phame

Summary: Ref T12819. Mostly straightforward, with a couple of minor query modernization things.

Test Plan: Indexed and searched for posts and blogs.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12819

Differential Revision: https://secure.phabricator.com/D18565