Since our forum runs on a shared server, using Elastic Search is out of the question. That's where AndyB's Advanced Search add-on steps in to take up the slack left by XenForo's core search functions.
The fact it allows for small word searches is a godsend for us! After migrating from vB over to XF, this add-on has been instrumental in helping us to find left-over remnants of faulty BBCodes here and there. Kudos on a job well done!
Easy install and works well in my testing! I just wish that all the search options could be using the same search box instead of cluttering up the navigation bar with another search. But other than this this rocks.