The JavaScript language plugin allows to have javascript as the language of scripts to execute.
'org.elasticsearch.plugin:lang-javascript:2.1.2'
<dependency>
<groupId>org.elasticsearch.plugin</groupId>
<artifactId>lang-javascript</artifactId>
<version>2.1.2</version>
</dependency>
<dependency org="org.elasticsearch.plugin" name="lang-javascript" rev="2.1.2"/>
"org.elasticsearch.plugin", "lang-javascript", "2.1.2"