This plugin provides b-bit langfield algorism.
'org.codelibs:elasticsearch-langfield:2.1.2'
<dependency>
<groupId>org.codelibs</groupId>
<artifactId>elasticsearch-langfield</artifactId>
<version>2.1.2</version>
</dependency>
<dependency org="org.codelibs" name="elasticsearch-langfield" rev="2.1.2"/>
"org.codelibs", "elasticsearch-langfield", "2.1.2"