According to Little Snitch this process is constantly trying to phone home to configuration.apple.com:443
My tinfoil hat tells me, since Apple is really invested on data mining, this service is phoning home on your text usage similar to the likes of SwiftKey but, yes, using your l'il ol' actual keyboard. It'll eventually be used to tailor searches and advertising, etc. It's using 0.0% CPU for me because I block it.