ES 5.X 版本后就不支持 elasticsearch-head  以插件方式来安装了。

for Elasticsearch 5.x: site plugins are not supported. Run as a standalone server

for Elasticsearch 2.x: sudo elasticsearch/bin/plugin install mobz/elasticsearch-head

for Elasticsearch 1.x: sudo elasticsearch/bin/plugin -install mobz/elasticsearch-head/1.x

for Elasticsearch 0.x: sudo elasticsearch/bin/plugin -install mobz/elasticsearch-head/0.9

open http://localhost:9200/_plugin/head/

Google 一番发现很多都是使用源码的方式， node ，grunt 一顿配置 ，相对比较繁琐;其实 elasticsearch-head 官方还可以使用 docker 容器的方式来运行，简单粗暴

Running with docker

for Elasticsearch 5.x: docker run -p 9100:9100 mobz/elasticsearch-head:5

for Elasticsearch 2.x: docker run -p 9100:9100 mobz/elasticsearch-head:2

for Elasticsearch 1.x: docker run -p 9100:9100 mobz/elasticsearch-head:1

for fans of alpine there is mobz/elasticsearch-head:5-alpine

最后记得配置跨域，重启 ES ，访问 http://localhost:9100/

#Enable CORS in elasticsearch
http.cors.enabled: true
http.cors.allow-origin: "*"

REFER:
https://docs.docker.com/engine/installation/linux/docker-ce/ubuntu/
https://github.com/mobz/elasticsearch-head

Elasticsearch 5.X 使用 Docker 运行使用 Head 插件