It is not abundantly clear in any of the documentation that this is a feature that requires an Enterprise License.
For something that is in Beta, Experimental and might not make it into GA anytime soon, why would this be so.
A lot of bandwidth, network or security conscious tech enthusiasts that sit outside enterprises do have this requirement, for such a set-up, so it would be good to know before hand when investing time into a solution that you only realize is an enterprise feature via the error logs.