Homestyx hydra

R1:d8132db75b83

Support Ferret engine in Pholio

Summary: Ref T12819. Support for Pholio.

Test Plan: Indexed and searched mocks.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12819

Differential Revision: https://secure.phabricator.com/D18569
Repository: R1 hydra
Commit Date: Sep 7 2017