After enabling the mediainfo repo (which pulls in wikibasecirrussearch alongside a truckload of other things) and provisioning, I get
==> default: Notice: /Stage[main]/Role::Cirrussearch/Mediawiki::Maintenance[build_search_index]/Exec[build_search_index]/returns: Couldn't update existing mappings. You may need to reindex. ==> default: Notice: /Stage[main]/Role::Cirrussearch/Mediawiki::Maintenance[build_search_index]/Exec[build_search_index]/returns: Here is elasticsearch's error message: mapper_parsing_exception: analyzer [aa_plain] not found for field [plain]
on the main wiki (where WikibaseRepo and WikibaseMediaInfo are enabled) but not otherwise.