Hey guys,

We've been running a 5 node cluster for our index (5 shards, 1 replica, 
evenly distributed on 5 nodes), and are running into a problem with one of 
the nodes in the cluster. It is not unique to any specific node, and can 
happen sporadically on any of the nodes.

One of the machines starts spiking up close to 100% CPU Load, and close to 
8 OS Load (which is amusing, considering there are only 4 CPU cores on the 
machine), while all the other machines operate normally way below those 
figures. Naturally, this behavior is accompanied by extremely high write 
times, and read times, as well.

Here's what Marvel looks like:

<https://lh5.googleusercontent.com/-bxUFPhqAnVk/U9gKg4c19nI/AAAAAAAAABE/S_w68vZ63Uo/s1600/Marvel+-+Node+Statistics.png>

Here's all the information we could gather:

   - Full thread dump from while this 
   occurred: https://gist.github.com/danielschonfeld/ff6c3744197f2c748632
   - GET 
   _nodes/stats: https://gist.github.com/schonfeld/693c8dbf0dd57e4cff7c
   - GET 
   _nodes/hot_threads: https://gist.github.com/schonfeld/766d771d211e452a7100
   - GET 
   _cluster/stats: https://gist.github.com/schonfeld/d5395f97e3a87745cc1f
   

Thoughts? insights? Any clues would be greatly appreciated. 

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