elasticsearch: bootstrap checks failed

**ERROR [localhost] node validation exception
1] bootstrap checks failed
1]:the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured**

[root@localhost elasticsearch]# vi /etc/elasticsearch/elasticsearch.yml

#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
cluster.initial_master_nodes: ["node-1"]
#
# For more information, consult the discovery and cluster formation module documentation.
#