How to do it…

Elasticsearch provides a script for automatic downloads and for the installation of plugins in bin/directory called elasticsearch-plugin.

The steps that are required to install a plugin are as follows:

Calling the plugin and installing the Elasticsearch command with the plugin name reference.

For installing the ingested attachment plugin used to extract text from files, simply call and type the following command if you're using Linux:

bin/elasticsearch-plugin install ingest-attachment

And for Windows, type the following command:

elasticsearch-plugin.bat install ingest-attachment

If the plugin needs to change security permissions, a warning is prompted and you need to accept this if you want to continue.
During the node's startup, check that the plugin is correctly loaded.

In the following screenshot, you can see the installation and the startup of the Elasticsearch server, along with the installed plugin:

Remember that a plugin installation requires an Elasticsearch server restart.