Performance impact of running a cluster on SSL

My organization is considering whether to run our ES clusters on SSL and I've been tasked with evaluating the performance impact of a cluster on SSL vs a cluster over plain TCP/HTTP.
Since there are two modes of communication, 1. Within the cluster (between nodes of the cluster) and 2. With clients of the cluster (over https), I will need to evaluate the performance impact of both.

I was wondering if anyone in this community has done a similar evaluation and has any performance testing setup that I could reuse or has results that they would be willing to share with me.

You could definitely use Rally for this.

We are publishing our benchmarks at for different use cases with and without security enabled, so these might also be of use to you for your evaluation.

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