[2019-04-18T10:22:34,929][WARN ][o.e.c.c.ClusterFormationFailureHelper] [es-1] master not discovered yet, this node has not previously joined a bootstrapped (v7+) cluster, and [cluster.initial_master_nodes] is empty on this node: have discovered ; discovery will continue using from hosts providers and [{es-1}{7KOkSP8JREiCgYXhYhmVOQ}{QbeU_ObJQZewVu8VcR0pSA}{30.16.27.210}{30.16.27.210:9300}{ml.machine_memory=16639909888, xpack.installed=true, ml.max_open_jobs=20}] from last-known cluster state; node term 0, last-accepted version 0 in term 0
ENV： CentOS Linux release 7.5.1804 (Core)
It looks like you have not bootstrapped this cluster yet.
hello david,
my es is single node, i follow your suggestions, config bootstrap,when i restart my es ,still report errors,ps 
[2019-04-19T07:49:23,452][INFO ][o.e.c.c.ClusterBootstrapService] [es-1] skipping cluster bootstrapping as local node does not match bootstrap requirements: [elk]
[2019-04-19T07:49:33,457][WARN ][o.e.c.c.ClusterFormationFailureHelper] [es-1] master not discovered yet, this node has not previously joined a bootstrapped (v7+) cluster, and this node must discover master-eligible nodes [elk] to bootstrap a cluster: have discovered ; discovery will continue using from hosts providers and [{es-1}{7KOkSP8JREiCgYXhYhmVOQ}{Dr_EC80vQTaqgS5yNXTBSA}{30.16.27.210}{30.16.27.210:9300}{ml.machine_memory=16639909888, xpack.installed=true, ml.max_open_jobs=20}] from last-known cluster state; node term 0, last-accepted version 0 in term 0
thanks david, i change cluster.initial_master_nodes: equals my node.name,then restart es succees
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