Only set a DB index for ReviewRequest.summary.
Review Request #6498 — Created Oct. 23, 2014 and submitted
The previous change I had for adding an index for search added it in
BaseReviewRequestDetails. While we didn't need it for drafts, I figured
it didn't hurt.However, it exposed a bug in django-evolution, where, presumably due to
the base class, applying the change to ReviewRequest's signature also
affected ReviewRequestDraft's.I don't have a fix for that yet in django-evolution, so for now, I'm
splitting that field out and turning indexing on only for
ReviewRequest.summary.
Was able to successfully run an evolution on an older database.