High CPU percent in node stat

I have a 3 node cluster. Whenever there are too much traffic, the process CPU percent shoots upto 300%
This causes frequent ES timeouts. Any idea why this might happen?

It sounds like you are overloading your cluster and may need to scale up/out or limit the load. Do you have monitoring installed?

We are on very old version of ES - 1.3.4
I have marvel and kopf installed.

I would recommend upgrading, at least to the latest 1.7 release.

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