Secure Elastic in Graylog configuration for Kubernetes deployment

I have a kube enviroment where I have a graylog node and Elasticseach that is deployed out of Kubernetes.
So I need to create a configuration so that Graylog has to be the only element that can connect to it (I mean, Elastic should response to graylog only).

Consider that the graylog host can change as kubernetes has many ips
Is there a way to realize this configuration? How I can perform it?


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