Adam Russell@ivory can you explain this search result / error message?
Ivory by Tapbots 
@adamrussell Hitting the search icon on the keyboard only searches for posts and most servers don't have search enabled for posts as it's very CPU intensive. If you go to your instance website, do the same search, and hit the “Posts" tab, you'll get the same results.
@ivory got it. Is there no user search?
@adamrussell There is. The options show up once you enter text into the search box. Look at the options that appear below the text input box.
@ivory got it. I sort of (naively) assumed that the search would bring back whatever it could, i.e. users if there were no content results.
@adamrussell It will collate all the search data when we update it. Our search system is pretty old and in need of a huge overhaul. It's on our list to make it much better.
@ivory got it, thanks for explaining!