Hi!
I wrote a script to detect unused wmf-config code. [1] Specifically, unused settings and conditional blocks for configuration that no longer exists in MediaWiki.
The script cross-references any wg- identifiers in wmf-config with Legoktm's Codesearch tool [2] and reports those that have no matches outside wmf-config. [1]
I checked the CirrusSearch ones and most are indeed unused, except that this one: CirrusSearchCrossProjectBlockScoreProfiles - seems to have a mention as CirrusSearchCrossProjectBlockScorerProfiles - I wonder if it's a typo. Generally CirrusSearch uses some configs without 'wg' prefix, but in this case it doesn't seem to be an issue.
Open for review: https://gerrit.wikimedia.org/r/#/q/project:operations/mediawiki-config+topic...
This one produces 404.