IP is 127.0.0.1 is this a problem?

Elastic Stack Elasticsearch
1

_cat/nodes?v&h=id,ip,pid,port,v,m

Returns

id   ip         pid   port v     m 
IQSZ 127.0.0.1  4913  9300 1.6.0 * 
5Gko 10.1.88.21 29677 9300 1.5.1 - 
-Xcj 127.0.0.1  5579  9300 1.6.0 m 
Bdha 127.0.0.1  15776 9300 1.6.0 m

5Gko is a client, the rest are ES nodes.

  1. I have a feeling these should be reporting their actual IP not their localhost. Where do I set that?

  2. Client is using version 1.51, the cluster is all on 1.6.0. Problem, or no?