当为es集群设置完一次密码之后，再次执行相同的命令
./elasticsearch-setup-passwords interactive
报错：
Failed to authenticate user 'elastic' against http://172.16.xxx.xxx:9200/_security/_authenticate?pretty Possible causes include: * The password for the 'elastic' user has already been changed on this cluster * Your elasticsearch node is running against a different keystore This tool used the keystore at /usr/local/elasticsearch-7.2.0/config/elasticsearch.keystore ERROR: Failed to verify bootstrap password解决办法：
删除 .security-7 索引，然后重新执行上面命令即可，不用重启es集群
