discovery.seed_hosts

java.lang.IllegalArgumentException: unknown setting [discovery.zen.ping.unicast.hosts] please check that any required plugins are installed, or check the breaking changes documentation for removed settings

discovery.zen.ping.unicast.hosts: ["172.21.90.25:9300", "172.21.90.27:9300","172.21.90.27:9300"]
替换
discovery.seed_hosts: ["172.21.90.25:9300", "172.21.90.27:9300","172.21.90.27:9300"]

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