Wikis that have LiquidThreads enabled, or had it previously (have the thread table) should be checked for the thread_root_2 index, and it dropped if it exists.
It duplicates a default index
ALTER TABLE /*_*/thread DROP INDEX /*i*/thread_root_2;
See T180163 for the LQT bug
Table exists on:
s2
- enwiktionary (index not present)
s3
- enwikinews (index not present)
- fiwikimedia
- liquidthreads_labswikimedia (index not present)
- mediawikiwiki (index not present)
- ptwikibooks
- officewiki (index not present)
- strategywiki (index not present)
- sewikimedia
- svwikisource
- test2wiki
- testwiki (index not present)
- wikimania2010wiki (index not present)
- wikimania2011wiki (index not present)
s7
- huwiki (index not present)