Support providing an alternate name for elasticsearch when generating kustomize configs

[sjahl]

Our deployctl elasticsearch apply subcommand supports providing a custom name for the elasticsearch cluster. However, when creating a deployment with Kustomize, we didn't have that option. That means if you wanted to use the custom ES name that you chose when creating the ES cluster, you have to manually update the deployment manifests to point the API pods to the right ELASTICSEARCH_HOST and _PASSWORD secret.

part of #1343