[opendistro-1.8][backport] Update `checkNullElementsInArray()` unit test to check both error mes…#1420

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afazel wants to merge 1 commit intoopensearch-project:opendistro-1.8from afazel:od-1.8-bp-1157-update

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Commits on Aug 24, 2021

Update checkNullElementsInArray() unit test to check both error message and error code instead of only checking the error code (opensearch-project#1370 )
afazel
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