在部署 ElasticSearch7.13.4，啟動節點時報錯：
[2021-11-11T11:55:03,704][WARN ][o.e.c.c.ClusterFormationFailureHelper]
[es_192.168.16.143_9253] master not discovered yet,this node has not previously joined a bootstrapped (v7+) cluster,
and this node must discover master-eligible nodes [
es_192.168.16.90_9253,
es_192.168.16.143_9253,
es_192.168.17.15_9253,
es_192.168.16.154_9253,
es_192.168.16.139_9253,
es_192.168.16.87_9253,
es_192.168.16.98_9253] to bootstrap a cluster:
have discovered [
{es_192.168.16.143_9253}{iqIiy9v3QEy486Mokda1JQ}{uraxlZ4pQTmauo2PYeyi8A}{192.168.16.143}{192.168.16.143:9353}{m},
{es_192.168.17.15_9253}{ehhbV1L4Sd6q4iEHD2ZXgw}{CsRqqbF5SDizhu8sMnk_mw}{192.168.17.15}{192.168.17.15:9353}{m},
{es_192.168.16.90_9253}{W2Syx-M1Tf2wOXJzcwIpuw}{azVBifMUTPyHTiOkKxGEGw}{192.168.16.90}{192.168.16.90:9353}{m}];
discovery will continue using [192.168.16.90:9353, 192.168.17.15:9353] from hosts providers and [{es_192.168.16.143_9253}{iqIiy9v3QEy486Mokda1JQ}{uraxlZ4pQTmauo2PYeyi8A}{192.168.16.143}{192.168.16.143:9353}{m}] from last-known cluster state; node term 0, last-accepted version 0 in term 0
報錯解析：
master節點還沒選舉出來，原因就是 在 master-eligible nodes 列表里的節點，必須有 N/2+1 個節點已啟動才能進行選舉出 master
也就是說：1.master節點啟動個數不夠 2. 節點啟動了但是角色不是master
我這個里的報錯原因：
配置文件中初始的master列表（3個master） cluster.initial_master_nodes: [] 配置文件中集群中所有節點列表（總共7個節點：3-master、2-data、2-coordinating） discovery.seed_hosts:[] 我把上面的量參數值，寫反了，導致有啟動時認為有7個master，雖然所有節點都啟動了，但是實際上就3個master，4個非master節點
總結：
遇到 master not discovered yet 這種報錯，不要慌，基本都是自己的配置或啟動問題導致的