Invalid NEST response built from a successful (200) low level call on PUT

I am running with elasticsearch 7.12.1 on Ubuntu 20.04.2 LTS.
Only elasticsearch is running on port 9200. Kibana is also installed on the same VM, port 5601 but its service is currently stopped.
I am using NEST to connect with this Elasticsearch on port 9200.
I am calling Client.LowLevel.Indices.CreateAsync(...) method to create the index.
The index is created successfully. But IsValid property on the response is false and it says above message.
I have also tried by setting settings.DisableDirectStreaming() but no difference.
Could you please let me know, if I am doing something wrong?

Thanks
Niaz

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