New pages with apostrophe characters aren't indexed by external web search engines. Sampling a random sentence from a page with a title containing ' character in its title will yield no result in web search. The examples below aren't too fresh - so it is old enough for search engines to index.
Old pages (0.5 year old) containing apostrophe character in their title are indexed - so this is probably a regression from the last month or so. I'm not sure whether it is a MediaWiki issue or search engine issue (cross posts - see below).
__Exmples__
English Wikipedia examples:
* https://en.wikipedia.org/w/index.php?title=Conference_USA_Men%27s_Soccer_Freshman_of_the_Year (works in Bing, doesn't work in Google and Baidu)
* https://en.wikipedia.org/w/index.php?title=Holland%27s_Next_Top_Model_%28cycle_8%29 (works in Bing, doesn't work in Google and Baidu)
Hebrew Wikipedia examples:
* https://he.wikipedia.org/wiki/%D7%9E%D7%99%D7%A7%D7%94_%D7%91%D7%96'%D7%96'%D7%99%D7%A0%D7%A1%D7%A7%D7%99 (created at 30 August 2015; doesn't yield results in Google and Bing)
* https://he.wikipedia.org/wiki/%D7%92'%D7%A8%D7%9E%D7%99_%D7%A7%D7%95%D7%A8%D7%91%D7%99%D7%9F (created at 14 August 2015; doesn't yield results in Bing and Google)
__Debug info__
I"m not sure it is a MW issue but I tried to check the following options
* probably not an issue with dumps script - e.g bzcat DUMPFILE | grep _NEW_PAGE_WITH_APOSTRPHE
* probably not an issue with API (there are no complaints on other issues that this would cause)
* probably not an issue with new pages ATOM
* no relevant exclusion in robots.txt (if I didn't miss anything)
__See also__
* https://duck.co/forum/thread/15098/hebrew-wikipedia-articles-with-in-their-names
* https://productforums.google.com/d/msg/webmasters/wTPr_r_73sc/KyYsScvOnB4J