Elasticsearch error: cURL error 28: Operation timed out after 20001 milliseconds with 0 bytes received

I am getting lot of error log about Elasticsearch error: cURL error 28: Operation timed out after 20001 milliseconds with 0 bytes received

Code:

Server error log

XFES\Elasticsearch\ConnectException: Elasticsearch error: cURL error 28: Operation timed out after 20001 milliseconds with 0 bytes received src/addons/XFES/Elasticsearch/Api.php:368

Generated by: Unknown account Dec 1, 2017 at 6:25 PM

Stack trace

#0 src/addons/XFES/Elasticsearch/Api.php(312)...

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