Externalize the elasticsearch.yml file when using the elasticsearch-transport-wares

Hello,
I'm currently using the elasticsearch-transport-wares plugin to start an ES node.
I check the NodeServlet class and it seems that it explicitly expecting the elasticsearch.yml file in the WEB-INF/lib folder.
Does it exist a way to define this elasticsearch.yml file from outside the WEB-INF/lib my WAR ? Or a way to override it ?
Thanks,
Thib