[TESTS] TransformApiTests throwing JsonParsingException

[russcam]

It looks like some of the TransformApiTests are failing on CI due to a JsonParsingException:

https://github.com/elastic/elasticsearch-net/pull/5177/checks?check_run_id=1561871433

• Tests.XPack.Transform.TransformApiTests.StopTransformResponse
• Tests.XPack.Transform.TransformApiWithSettingsTests.ReturnsExpectedResponse
• Tests.XPack.Transform.TransformApiTests.DeleteTransformResponse
• Tests.XPack.Transform.TransformApiWithSettingsTests.ReturnsExpectedStatusCode

Elastic.Transport.UnexpectedTransportException : expected:'Number Token', actual:'"2014-12-29T00:00:00.000Z"', at offset:79
---- Nest.Utf8Json.JsonParsingException : expected:'Number Token', actual:'"2014-12-29T00:00:00.000Z"', at offset:79`

[stevejgordon]

I believe @Mpdreamz has some commits which address these failures in his WIP transport PR.

[Mpdreamz]

#5046 has some fixes for timeouts, not for this parsing issue.

[stevejgordon]

Confirmed these occur on the new 7.11 branch so will fix as part of getting that prepared.