The priority of document %1, %2 owned by %3 was changed to %4 on %5. Windows prints the document with the highest priority ...

The priority of document %1, %2 owned by %3 was changed to %4 on %5. Windows prints the document with the highest priority number before other print jobs with lower priority numbers. Documents that are currently printing are unaffected by changes in priority. No user action is required.
To stop logging information events for the print spooler, in Control Panel, open Printers, right-click a blank area of the window, click Run as Administrator, click Server Properties, click the Advanced tab, and then clear the Log spooler information events check box.