[opendistro-1.0][backport] Add validation for null elements in JSON array (#1157)

[afazel]

(cherry picked from commit 960d420)

opensearch-security pull request intake form

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

2. Github Issue # or road-map entry, if available:

3. Description of changes:

4. Why these changes are required?

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

6. Testing done: (Please provide details of testing done: Unit testing, integration testing and manual testing)

7. TO-DOs, if any: (Please describe pending items and provide Github issues# for each of them)

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

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[codecov-commenter]

Codecov Report

Merging #1348 (3d946f1) into opendistro-1.0 (6d3de54) will increase coverage by 0.26%.
The diff coverage is 78.03%.

@@                 Coverage Diff                  @@
##             opendistro-1.0    #1348      +/-   ##
====================================================
+ Coverage             62.33%   62.60%   +0.26%     
- Complexity             2869     2897      +28     
====================================================
  Files                   221      223       +2     
  Lines                 15843    15918      +75     
  Branches               2974     2987      +13     
====================================================
+ Hits                   9876     9965      +89     
+ Misses                 4431     4403      -28     
- Partials               1536     1550      +14     

Impacted Files	Coverage Δ
...arch/security/ssl/OpenDistroSecuritySSLPlugin.java	82.46% <0.00%> (ø)
...ort/OpenDistroSecuritySSLTransportInterceptor.java	0.00% <0.00%> (ø)
...lasticsearch/security/support/ConfigConstants.java	85.71% <ø> (ø)
...arch/security/dlic/rest/api/AbstractApiAction.java	76.21% <60.00%> (+1.32%)	⬆️
...rch/security/setting/OpenDistroDynamicSetting.java	60.00% <60.00%> (ø)
...ticsearch/security/configuration/CompatConfig.java	38.23% <66.66%> (+10.64%)	⬆️
...ecurity/configuration/ConfigurationRepository.java	74.23% <79.59%> (+4.90%)	⬆️
.../security/setting/TransportPassiveAuthSetting.java	80.00% <80.00%> (ø)
...transport/OpenDistroSecuritySSLRequestHandler.java	59.45% <83.33%> (-3.78%)	⬇️
...ty/transport/OpenDistroSecurityRequestHandler.java	68.14% <83.33%> (+1.21%)	⬆️
... and 20 more

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