Switch normal query from match to simple_query_string

Summary:
It's like query_string but fails a little nicer on bad
input. It also allows for limited Lucene syntax; notably
exact string matches with quotation marks.

Fixes T6780

Test Plan:
Tested multiple query constructions, including exact string
matching.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Maniphest Tasks: T6780

Differential Revision: https://secure.phabricator.com/D11011