bootstrap checks failed,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

Linux安装ElasticSearch，修改配置文件elasticsearch.yml 后启动失败。

• CentOS Linux release 7.5
• ElasticSearch version 7.3.0
• Java openjdk version 1.8.0_222

vim /etc/elasticsearch/elasticsearch.yml