I was able to configure it through sense and through pure java... but haven't found any resources to do it using elasticray ... I am using Liferay 6.2
You simply need to change the template.json file located in webs/elasticray-web/docroot/WEB-INF/src/com/rknowsys/portal/search/elastic to suit your changes.
Then you can rebuild the WAR and redeploy it inside Liferay. That will do the job.