The Backdrop core search module appears to not include indexing of comments when they are enabled. Is there a way to make search also index comments or a module that will do this?
As pointed out below the core search does include search of comments but only the comments on the first page with the node. When the pager is in effect, comments on the second or subsequent pages are not indexed.
Comments
If there is no response, alternatively, you can use a View with a list of comments, with a filter based on the comment text. I haven't tried it myself, I just got an idea.
I have created a new module comment_search
There is also Node Comments Search - this searches the node and all comments (default search is node and first page of comments) as part of the content search. Izzy's module above is a separate search for comments.
Worth mentioning as it was in zulip chat by @yorkshirepudding