support for elasticsearch 2 metrics

[Alec Ten Harmsel <alec@xxxxxxxxxxxxxxxxxx>]

Hi,

The ElasticSearch PMDA was mostly written in 2011-2013, and now the ES
REST API has changed. Specifically, some of the URLs have changed:

* _cluster/nodes/stats -> _nodes/stats
* _cluster/nodes -> _nodes

Are there any plans to add support for this new API? I searched on
bugzilla and tasks.pcp.io, and couldn't find anything referencing an
update of the elasticsearch PMDA.

I am planning on patching this for our elasticsearch cluster; is it
possible to get this work accepted upstream? Right now, I'm planning on
copying the elasticsearch PDMA to elasticsearch2, so that they can
coexist.

Regards,

Alec