There's a nice announcement by Staff in regards to Discussions update today.
"Today, I am thrilled to announce that a long-requested feature is getting its first release: search for Discussions posts!
New in the Special:Search page on the Unified Community Platform is a Posts option which allows you to search through Discussions posts. This has been a major user request since we first launched Discussions.
For now, default search behavior will not change, so you’ll need to enter Special:Search to get to the Post search tab. This first release is desktop-only and will not include Discussions results in the Everything tab or advanced search options. Next year, we plan to start experimenting to see how we can best surface relevant Discussions content in additional ways while respecting user intent with their search. We know you have a lot to say about this subject, as well as other aspects of search, and it is a conversation we are excited to have with you next year.
Until then, please enjoy the new search functionality and please give us feedback about it! We want to know what you like, don’t like, and/or wish was different about it. Your feedback will help fuel the next releases of this new feature." Feedback can be given directly on the blog comments: https://community.fandom.com/wiki/User_blog:MisterWoodhouse/Discussions_search_is_now_available
For desktop users, the following link can be used to search Discussions.
https://vampirediaries.fandom.com/wiki/Special:Search?scope=internal&query=&contentType=posts