Version 2.5.0 - ES Backend Listener (#287)
Version 2.5.0 - ES Backend Listener (#287)

* Switched to ES REST low-level client v6.4
  * Removed deprecated methods usage
* Added support for sending custom variables to ES.
ptrd/jmeter-plugins,ptrd/jmeter-plugins,ptrd/jmeter-plugins,ptrd/jmeter-plugins,ptrd/jmeter-plugins