The repository search index contains the rich-text content of discussions, but not their meta-content or properties. This means that discussion comments can match a search by full text, but not a search by properties like object type or creation date. You can, however, search for the names of comment authors.

When a discussion matches the search terms, the results show the parent object, not the discussion itself. You can open the discussion of any search result using the same methods as in other contexts.