I am getting lots of log messages in my 10.10 Server install. This was an upgrade from 10.9.5. I will get hundreds of the Gesture Started and Gesture Ended messages in a second with different numbers (i.e. 503xxx becomes 504xxx).
9:41:46 AM WindowServer: 50386035501120 -- Bookend Type: 62 (Gesture Ended) conn: 0xf8c7, window 0x5e 9:41:46 AM WindowServer: 50386035506584 ++ Bookend Type: 61 (Gesture Started) conn: 0xf8c7, window 0x5e 9:41:46 AM WindowServer: *** Complete ***