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

[afazel]

…sage and error code instead of only checking the error code (#1370)

(cherry picked from commit 0a2916b)

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1. Category: (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

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3. Description of changes:

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5. What is the old behavior before changes and new behavior after changes? (Please add any example/logs/screen-shot if available)

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8. Is it backport from main branch? (If yes, please add backport PR # and commits #)

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[codecov-commenter]

Codecov Report

Merging #1420 (2821aeb) into opendistro-1.8 (a7e6647) will increase coverage by 0.01%.
The diff coverage is n/a.

@@                 Coverage Diff                  @@
##             opendistro-1.8    #1420      +/-   ##
====================================================
+ Coverage             63.57%   63.58%   +0.01%     
- Complexity             3078     3079       +1     
====================================================
  Files                   236      236              
  Lines                 16742    16742              
  Branches               3015     3015              
====================================================
+ Hits                  10644    10646       +2     
+ Misses                 4545     4544       -1     
+ Partials               1553     1552       -1     

Impacted Files	Coverage Δ
...search/security/tools/OpenDistroSecurityAdmin.java	47.17% <0.00%> (-0.27%)	⬇️
...earch/security/auditlog/impl/AbstractAuditLog.java	75.00% <0.00%> (+1.07%)	⬆️

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