Yesterday we backfilled main_summary for 2017-06-01, 2017-05-31, and 2017-05-30, which also ran the search daily rollup. The search daily rollup doesn't handle backfill and always assumes it's running yesterday . I'll kick off a manual backfill for the search dataset today.  https://github.com/mozilla/python_mozetl/blob/master/mozetl/search/daily_search_rollups.py#L286
This should now be complete.