Ability to Completely Disable all Communication over port 8091

Currently there is a way to disable WebUI access to port 8091, and only allow encrypted access to the UI. This however keeps port 8091 open which is still used for non-encrypted communication between cluster nodes. In order to completely secure the environment this communication should be configurable to happen over encrypted channels, and there should be the ability to completely disable the non-encrypted port 8091.