Well, it was a bug and Google is now in the process of fixing it now. In fact, I personally am seeing data fill into my Search Analytics report.
September 2-6, 2016 (repair in progress)
A system error dropped all Search Analytics data from Sept 1-6. However we are now repairing this gap, and hope to completely fill the gap soon.
So expect it to be fixed fully shortly and then you can see if you benefited or not from the Google weekend update.
Forum discussion at Twitter.