1、elasticsearch head安装
集群连不上，修改配置
add http.cors.enabled: true
you must also set http.cors.allow-origin because no origin allowed by default. http.cors.allow-origin: "*" is valid value, however it’s considered as a security risk as your cluster is open to cross origin from anywhere.
https://github.com/mobz/elasticsearch-head
启动命令
npm run start
2、Spring boot 启动连不上
cluster-nodes: 127.0.0.1:9300
端口号问题
1.9300端口： ES节点之间通讯使用
2.9200端口： ES节点 和 外部 通讯使用
9300是tcp通讯端口，集群间和TCPClient都走的它；9200是http协议的RESTful接口
3、spring boot es 配置
缺少cluster-name
