版本：7.17.5
错误信息：
ERROR: [1] bootstrap checks failed. You must address the points
described in the following [1] lines before starting Elasticsearch.
bootstrap check failure [1] of [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 ERROR: Elasticsearch did not exit normally - check the logs
at /usr/local/elasticsearch-7.17.5/logs/test-ES.log
解决方法：
到安装目录的config目录，编辑elasticsearch.yml
vim elasticsearch.yml
找到-------discovery-------，做如下修改
