Request time-out in bulk update

I am making a bulk request ( 1000 doc) per bulk request in Elasticsearch 5.5.1 and it's getting time-out sometimes ( I have 30 sec. time-out configured in yml file).
Now, I actually need to trace the details of the time out log.
when I check the default elasticsearch.log file, it doesn't have much info about bulk request but client side it shows request timeout after waiting for 30000 ms
How should I find/configure the error log to get the root cause of the time-out to see what took long time, Please suggest? Thanks.

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