The wiki's page search seems to only search by page keyword

The docs suggest that this should work. I can't see where page search is configured.
But it should find all pages that have any keyword by default please.

Start by reading the documentation's page-search guidance and reproduce the wiki search behavior described in the issue. Locate where wiki page search is configured, then verify that a default search considers pages by their keywords and finds the expected pages. Done means the documented behavior and the actual default search behavior agree.

Written by the indexing model from the issue text.