I think I'm more surprised that this was a surprise to people. Of course they built a search engine. Wouldn't you? Don't you have similar at your workplace? We use them all the time. Think about web interfaces built on top of ElasticSearch, for example. Is that not a 'search engine'?
It's the opening it up to LEO. Taking homeland security-justified warrantless searches and turning those over to criminal investigations is far beyond unconstitutional.