I'm currently working on correcting the spelling of "subgenre" in Wikipedia, and while the search engine updates with ordinary changes within several seconds, it does not do so for those that come from transcluded sources. E.g., I [https://en.wikipedia.org/w/index.php?title=Jazz&action=history updated the "Jazz" article] on 21 December, but the spelling "sub-genre" [https://en.wikipedia.org/w/index.php?title=Special:Search&search=%22sub-genre%22&ns0=1&ns14=1&ns100=1&fulltext=Search still appears in the search engine results].