api.php endoint, when displaying the autogenerated help page (when called without parameters or with action=help), should output meta tags to prevent it from being indexed by search engines, since there's nothing useful to index there. Those links even have example URLs with usage. This adds unnecessary load to the server when search spiders kick in, and may cause unwanted results to be indexed.
The problem was brought on Support Desk
And anyone could see that it's being indexed with a simple query: https://www.google.com/search?q="MediaWiki+API+help"