Elasticsearch Python client - IncompleteRead error

I'm running an Elasticsearch cluster version 6.3.2.
I'm using Python client to query the Elasticsearch.
Python version - 2.7.5
Python Elasticsearch client version - 6.3.0

Suddenly I started to get this kind of error (not for a specific query):
caused by: ProtocolError(('Connection broken: IncompleteRead(4178374 bytes read, 1111117 more expected)'

I'm using Apache as a reverse proxy to Elasticsearch API.
No errors in Elasticsearch logs or Apache.

Can you please assist?
Thank you.

Do you see the same problem if you connect directly to Elasticsearch? If that is not the case, it is likely a problem with your proxy configuration.

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