Mediawiki cannot find 'three' in search

Question

I have two installations of mediawiki on two different hosting services. When I search for 'three' it can find it in pagenames to display on the search dropdown while I am typing, but cannot find it in the pagename or body for the actual search.

If I search for 'three a' it lists pages with 'a', and then bolds 'three' on the listing.

https://2ndbook.org/w/index.php?search=Three&title=Special%3ASearch&profile=all&fulltext=1

https://sensusplenior.net/wiki/index.php?title=Special%3ASearch&profile=advanced&fulltext=Search&search=Three&ns0=1&ns6=1&ns8=1&ns10=1&ns14=1&profile=advanced

I use a Hebrew font and switch to it while typing using Win+space.

I don't have command line access to either installation.

I have tried deleting pages and recreating them. Adding 'three' to random pages.

Perhaps there is a unicode character in the body if a page which kills the search?

Added: I have a Terminology page that stressed the limits of transclusions. Each single and double letter Hebrew entry had four or more transclusions. I have since emptied that page, and it did not resolve the issue.

Answer 1

'Three' is on the list of stop words. The fix is here:

https://dev.mysql.com/doc/refman/5.6/en/fulltext-stopwords.html

And it is a reminder that black swan events are built into the invisible assumptions that come along with all the tech we adopt without fully understanding.