Azure Elastic Cloud - NEST Client - API call fails with Faulted

On Azure, we have a.Net Core App that connects to ES Cloud. The app makes use of the NEST client. We've recently noticed intermittent issues where the client call to ES would fail at random. Azure Insight reports that it failed with the error code Result Code = Faulted. It does not provide any additional information. We looked up the root cause on Google. So far, we've reached a dead end. Is anyone aware of the potential problem?

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