背景：将节点设置为1后RED消失。

elasticsearch单个node节点写入数据-CSDN博客 

elasticsearch 写入新数据测试（二）-CSDN博客

参数设置如下：

discovery.seed_hosts: ["81.70.16.18"]

cluster.initial_master_nodes: ["node-1"]

gateway.recover_after_nodes: 1

xpack.security.enabled: true

然后重启，设置密码，此时发现RED消失了

./bin/elasticsearch-setup-passwords interactive

Initiating the setup of passwords for reserved users elastic,apm_syste