We need this simple schema change deployed:
- The patch is: https://gerrit.wikimedia.org/r/#/c/309825/
- The sql patch is: https://gerrit.wikimedia.org/r/#/c/309825/2/sql/patch-ores-model-indexes.sql
- Wikis needing this: enwiki, wikidatawiki, fawiki, ptwiki, plwiki, nlwiki, ruwiki, trwiki
- It removes an index and adds a new one.