ddprofiler throws RemoteTransportException with elasticsearch v2.3.5

[jmftrindade]

Noticed today while running ddprofiler against my local installation of elasticsearch 2.3.5. The ddprofiler server started throwing the following exception:

org.elasticsearch.transport.RemoteTransportException: [Failed to deserialize response of type [org.elasticsearch.action.admin.cluster.node.liveness.LivenessResponse]]

This only happens after commit 0ee4a9a - Merge algebra into master. I'm guessing because of the transport changes on the store client?

Workaround: I downgraded to elasticsearch v2.3.0 as per requirements.txt, and then it works fine.

[raulcf]

I'm guessing because of the transport changes on the store client?

I think so. I think if we change the storeClient from the native (the current one that causes trouble in 2.3.5) to the REST-based one it should work just fine.

The elastic people indicate that it is not guaranteed that native clients work across versions:

https://www.elastic.co/blog/found-interfacing-elasticsearch-picking-client#transport-client

Since the native client performs a bit better, I'd keep the native as default and probably add a property to configure the storeClient one wants.