If you use the paid version of Google Site Search then be aware Google is shutting it down this year. Here’s SEL with the news.
You’ll have to find a replacement, one of which is the free Custom Site Search – basically the same as Google Site Search but shows ads.
Interestingly if you go to the Google Site Search page you can still sign up – at least for another month or so. Not sure why you’d want to do that, since it won’t be around much longer, but each to their own.