code: def kill_application(self, app_id, user=""):
          
          self._call('kill', proto.KillRequest(id=app_id, user=user))
docs: Kill an application.
  
          Parameters
          ----------
          app_id : str
              The id of the application to kill.
          user : str, optional
              The user to kill the application as. Requires the current user to
              have permissions to proxy as ``user``. Default is the current user.