Technical Note: ZoneFox 3 - Installing Elasticsearch plugins
Installing Elasticsearch plugins
Scope
Installation and Administration
Solution
A number of plugins have been created for Elasticsearch, which allow system administrators to use a web front end to browse and interact with their Elasticsearch cluster. For example:

To check what plugins have already been installed in your system, login to the Linux box where Elasticsearch is installed and change to the installation directory, e.g:
cd /usr/share/elasticsearch
Run the command:
bin/plugin --list
To install the head plugin, run the commands:
sudo -s
bin/plugin --install mobz/elasticsearch-head
This tool can be accessed in a browser via a URL like: http://<db_server_address>:9200/_plugin/head
Other tools include kopf, HQ and bigdesk. Note that these are all non-core and community created plugins.