[BLOCKER] High latencies from ES 5.1.2 during search from kibana

I recently upgraded to ELK 5.1.2 stack. I am trying to execute a simple search on all indexes (last 7 days filter) from kibana. I found that ES is taking a an average of 15 seconds to search an index. Following is a screen capture describing the _msearch taking long duration for an index:

As you see above, the _msearch is taking 15 seconds to search an index. This is a major problem and is blocking us from moving to production environments.

Can anyone let me know what is going wrong.

Can someone suggest something about this issue please.

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