Elasticsearch frequent grabage collection

I have an elasticsearch cluster(2.1.1) with 4 nodes in production. All the nodes have the same JVM configuration with heap size set as 31 GB. In one node, elasticsearch process have high CPU usage. On checking the logs on the node, it shows garbage collection related messages. There is a very high load in that node. Even after stopping indexing and querying the cluster, the node shows high load compared to other nodes. This effects performance of the cluster. How can I solve this issue? I don't have any knowledge about the internals of the JVM. It will be great if anyone can help me to understand what causes the issue?

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