OS X Yosemite spotlight search wikipedia and web content missing
This could be related: https://www.apple.com/ios/feature-availability/#spotlight-suggestions-spotlight-suggestions

It's a list of countries that have Spotlight Suggestions enabled in iOS 8. If this is true, this is a pretty bad move from Apple.

Source: macrumors discussion

UPDATE: Apple confirms that


  Spotlight Suggestions may not be available in all regions.


on the Spotlight support page.