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elasticsearch 5.0/5.0.1以上版本的elasticsearch-head插件，使用node单独运行，会出现跨站访问的问题：

http://localhost:9200/_nodes. No 'Access-Control-Allow-Origin' 
header is present on the requested resource. 
Origin 'http://localhost:9100' is therefore not allowed access.

elasticsearch-head 安装教程如下：

1、安装node；
2、下载elasticsearch-head，安装node组件：

>git clone git://github.com/mobz/elasticsearch-head.git
>cd elasticsearch-head
>npm i
>npm i grunt-cli -g
>grunt server

3、elasticsearch.yml 增加配置项

http.cors.enabled: true
http.cors.allow-origin: /http?:\/\/127.0.0.1(:[0-9]+)?/

4、Gruntfile.js 增加hostname配置项

connect: {
         server: {
            options: {
               port: 9100,
               hostname: '*',
               base: '.',
               keepalive: true
            }
         }
      }

5、修改配置文件后各自重启

http://127.0.0.1:9100/ 访问即可(http.cors.allow-origin 里配的是127.0.0.1哦)