Here is another significant regression I noticed when searching things in JS pages:
Lucene: Results 1–20 of 630 for "mw.loader.load" AND "en.wikipedia.org"
https://en.wikipedia.org/w/index.php?search=%22mw.loader.load%22+AND+%22en.wikipedia.org%22&title=Special%3ASearch&go=Go&srbackend=LuceneSearch
Cirrus: There were no results matching the query.
https://en.wikipedia.org/w/index.php?search=%22mw.loader.load%22+AND+%22en.wikipedia.org%22&title=Special%3ASearch&go=Go&srbackend=CirrusSearch
See Also:
*T70782: Almost no results for intitle: searches in JS pages
*T70527: Differences in search results for JS variables/strings
*T73101: Cirrus misses many JS pages on some searches (Lucene finds them)