Allow for age-based filtering when reindexing for search.

Review Request #5937 — Created June 5, 2014 and submitted — Latest diff uploaded

Information

Review Board
release-2.0.x
84abbaa...

Reviewers

This updates our SearchIndex to tell Haystack which field should be
considered to determine the age of a review request, in order to speed
up filtering.

Now, when running update_index with --age=<hours>, only review
requests that have been updated in <hours> will be updated or added to
the index.

Ran a full index, then updated some content and ran an index with --age=10.
Saw it just pull in the new updates instead of reindexing everything.