NIFI-5890 Added a unit test that proves that 1.9 fixes a bug in the d…

[MikeThomsen]

…ate conversion behavior in 1.8.

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[ijokarumawak]

Hi @MikeThomsen I confirmed that the added test case fails with NIFI 1.8.0 but passes with 1.9.0 snapshot. I am going to merge this PR without the change to PutElasticsearchHttpRecord as it should be a mistake. Thanks!

[ijokarumawak]

I believe this change is not intentional.

[MikeThomsen]

Yeah, definitely not. Thanks!