Nest ElasticClient is losing exception information in Async calls

[vbfox]

At line 145 of ElasticClient.cs the current code looks like :

if (mr != null)
    throw mr;

var ae = r.Exception.Flatten();
if (ae.InnerException != null)
    throw ae.InnerException;
throw ae;

Re-throwing exceptions without wrapping them with throw ex; mean that their callstack is completely erased (more details), the code should wrap the exceptions in a new exception and throw that instead.

Note: I remarked the issue as it happens on a production system and made our investigations of the problem harder than necessary