In a search like "unapproved=" a string that can be seen in current spambot urls, it seems to overwhelm the search and a timeout results
https://tools.wmflabs.org/global-search/?q=%22unapproved=%22
similar search with a question mark "?unapproved" progresses fine
https://tools.wmflabs.org/global-search/?q=%22?unapproved%22
I am wondering whether there is a need for escaping or unicode converting this as it may think that it is active part of the url query rather than part of the search term.