As far as I can tell, full tag wikis do not seem to be indexed well by search engines, especially on beta sites. Tag wikis I made months ago on Genealogy & Family History SE cannot be found via a Google search. Questions and answers in contrast are indexed very quickly.
The content in tag wikis is a useful introduction to someone new to the subject. If they entered SE via the tag wiki after searching for basic info on a search engine, they then can immediately click on questions about that topic. I think it would be a great way to grow a site in beta. It would also be nice to have greater visibility of the tag wikis, because at present I don't think anyone really looks at them.
What – if anything – can be done to improve search engine indexing for tag wikis on beta sites?