This is good work. I thought there was no way to do this since Google Search blocks bots.
I assume allowing some low amount of obvious botting prevents people from developing really sneaky bots that are much harder to block. It's probably to prevent an arms race that google may not be able to win.
That gives me hope, as someone who wants to do low-frequency data analysis that's only possible via multiple queries.
Try Google Custom Search as well, $100 a year for 20k queries; I'm a client.
http://fortune.com/2017/02/21/google-site-search-discontinue...
The good news it's that it's reborn as an ad support version. Google doesn't want your dirty cash when your competitors are willing to pay much more for ad placement on your site.