OS X Yosemite seems to have gained the feature to “phone home” when you do spotlight searches. It’ll send search terms and your location data to Apple’s servers. Of course it’s perfectly in line with Apple’s recent “trust us, we won’t collect unnecessary data” rhetoric.
[…] Ashkan Soltani, an independent researcher and consultant, confirmed the behavior, labeling it “probably the worst example of ‘privacy by design’ I’ve seen yet.” Users don’t even have to search to give up their privacy. Apple immediately sends the user’s location to the company, according to Soltani.
You can turn it off, but it’s on by default.