You have to install the Process Manager bundle. I'm trying to achieve the same currently and have a related question here.
The documentation indicating the bundle is required can be found here - this is the link you yourself provided. You can tell you don't have it installed by running osgi:ls | grep process and seeing there's no reference to process-manager. This is a karaf shell command; all such commands can be found here .
It's also worth noting Process Manager is a FAB instead of a simple OSGi Bundle since it contains a Maven POM. This distinguishing feature is highlighted on this page .