I have uploaded google app java project to production google app engine (from this tutorial), but I can\'t found any information how to stop or disable the production app engine
Change you code to not serve pages and update the server online, or use the admin console and change the security settings so no one can see it.
i.e. go here..
https://appengine.google.com/ if you have a google app account then you should see that there's a "Disable or Delete Application" section.