This shell command script will terminate the Indigo Server (and built-in Indigo web server). It will also disable the "auto start on user login and auto relaunch if crash" behaviour. This will allow you to prevent the auto relaunch of the server if it ever starts misbehaving for any reason. NOTE: requires 3.0.6 or greater.
Double-click on the indigostop.command file. The terminal will launch and try multiple techniques to shut down and disable the server. To renable the server, run the Indigo client application on the server machine and choose the Indigo 2->Start Local Server... menu item.