解决： java.lang.RuntimeException: can not run elasticsearch as root

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种一棵树最好的时间是10年前，其次就是现在，加油！
                                                                                   --by蜡笔小柯南

一、问题分析

启动es时，报错：org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root

org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:173) ~[elasticsearch-7.17.25.jar:7.17.25]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:160) ~[elasticsearch-7.17.25.jar:7.17.25]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:77) ~[elasticsearch-7.17.25.jar:7.17.25]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112) ~[elasticsear