RT search slow after update

Probably worth doing as it means BP have visibility of it in their issue tracking system.

FWIW I’ve found I can “work round” our issue with a callback that turns LIKE into SHALLOW LIKE in the Search/Build.html. Need to do a bit of finessing over the next week or so, but that will at least stop existing saved searches our service desk folk have from blowing up 5.0.7.