Enabling ssl on intra-node communication in cluster?

A google search for enabling ssl on elasticsearch returns nothing but hits about enabling this for the the http communication.

What about the communication between the nodes in a cluster? The ones described here:

By default, anyone sniffing the packets between cluster nodes can see all the documents being sent between the nodes in plain text. How can this be secured?

Have a look at

I'm not sure how much of that works without Shield.


thanks nik, looks like Shield is the only way to go.

We used ipsec transport layer encryption to do this without Shield.