High load on ES 1.7.6 single node


we have an application that doesn't require a cluster (at least for now) and was running OK for a while with only one node.
Today we started to notice high load on the machine with no clear information in the logs.
Searching around I found something about hot_threads, but I'm not sure how to interpret the output. Can someone please help me troubleshoot this high load?

Here is the output of hot_threads:



It seems most of the load is related to searches. What type of queries are you running against the cluster?

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