英文参考：
Please download the zips here
https://oss.sonatype.org/content/repositories/releases/com/floragunn/search-guard-ssl/https://oss.sonatype.org/content/repositories/releases/com/floragunn/search-guard-2/
or install via
bin/plugin install -b com.floragunn/search-guard-2/2.4.1.11 bin/plugin install -b com.floragunn/search-guard-ssl/2.4.1.20
See http://floragunncom.github.io/search-guard-ssl-docs/installation.html andhttp://floragunncom.github.io/search-guard-docs/installation.html
一、安装search guard插件必须要安装两部分：
①search-guard-xx
②search-guard-ssl
（XX指的是与elasticsearch引擎对应的版本）
github地址：
https://github.com/floragunncom/search-guard
这里以elasticsearch 2.3.3版本为例
进入到elasticsearch安装目录（如果是用RPM包安装的，默认位置是，也可用命令whereis elasticsearch查看安装位置）
cd /usr/share/elasticsearch
安装方法：
（1）search-guard
elasticsearch版本：elasticsearch 2.x
bin/plugin install -b com.floragunn/search-guard-2/<version>
elasticsearch 2.3.3版本：
bin/plugin install -b com.floragunn/search-guard-2/2.3.3.11
elasticsearch版本：elasticsearch 5.x
bin/elasticsearch-plugin install -b com.floragunn:search-guard-5:<version>
（2）search-guard-ssl
elasticsearch 2.x
bin/plugin install -b com.floragunn/search-guard-ssl/<version>
elasticsearch 2.3.3版本：
bin/plugin install -b com.floragunn/search-guard-ssl/2.3.3.11
elasticsearch 5.x
bin/elasticsearch-plugin install -b com.floragunn:search-guard-ssl:<version>
注意事项：
当es的版本大于2.2时，安装过程中可能会有如下提示：
这个是正常现象，只要看到有以下提示就表示安装成功：
Installed search-guard-ssl into /usr/share/elasticsearch/plugins/search-guard-ssl
Installed search-guard-2 into /usr/share/elasticsearch/plugins/search-guard-2