JMichaelTX,
However, I'm very concerned that nothing in the wiki, not even the
title itself, is found by a Google search.
The wiki is set for public viewing. We want the wiki to be a great
resource for JXA, for everyone, not just our members.
GMF's Wiki is public and can be found in Google searches. So it isn't a general problem with Groups.io Wikis. Maybe with subgroup Wikis, I've just created one in a test group to see if it can be found. I haven't yet taken any measures (below) to call it to the attention of the search spiders. I'll let some time elapse first to see if it is found without such prompting.
If you the text you're searching for isn't unique enough there may be a great many pages that rank higher than yours. That is, your wiki might be found, but buried in other results.
To overcome that you could add site:groupname.groups.io to your search string to return only results within your group (primary and subs).
Or...
If the wiki is new the search spiders may not have found it yet. They're unlikely to find it if there are no links to it from other sites. If your group's messages are public, and already indexed, that would be one convenient place to put a link. That's probably how GMF's wiki was found.
I assume Groups.io publishes a sitemap, but I don't know if it includes user-supplied public content (Messages and Wikis, in groups where they are public). If so that would help immensely in having new pages be found by the spiders.
If all else fails you can tell Google's spider where to look:
There are probably similar facilities for other search engines.
Shal
Shal Farley