A few places need updating.
https://docs.couchbase.com/server/current/manage/manage-settings/general-settings.html#index-storage-mode
https://docs.couchbase.com/server/current/learn/services-and-indexes/indexes/storage-modes.html#per-page-bloom-filters
DOC-11303 Force enable plasma bloom filter for back index from 7.2.1
MB-57059 [Backport MB-56365 to 7.2.1] Enable index bloom filter by default
MB-56365 Enable index bloom filter by default