Deliberately timing coups for when the standing leader is on vacation is actually not all that uncommon, because it makes it possible to contain them under pretense of normalcy. E.g. Gorbachev in 1991, where they basically locked him up in his Crimean residence.

Its funny how Putin and Erdogan were meeting a couple of days ago. Maybe Erdogan was warned and took "a vacation"?

It was widely noted in the media that France closed its Turkish embassy (on "security fears") two days prior to this. It certainly makes you wonder if the word didn't get out.

It's important to remember that those "security fears" were in reference to Bastille Day.