Elasticsearch TransportExceptions under load

During the day when we have heavy search load I see a few TransportExceptions in the elasticsearch logs.

Transport response handler not found of id [7060268778]

We use libcurl to query elastisearch and this manifest's on the client side as

Curl Error at items/_count?: Failure when receiving data from the peer (56)

The search is simple filtering (no scoring) and getting counts. The CPU/Memory on all the nodes looks fine and don't see anything queueing on elasticsearch's end.
I am also seeing lots of young gc collections while this is happening which could be related. I am trying to understand under what conditions the exception occurs and what does it mean ?

Using elasticsearch 2.4 version.


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