[opendistro-1.9][backport] Add validation for null elements in JSON array (#1157)

[afazel]

(cherry picked from commit 960d420)

opensearch-security pull request intake form

Please provide as much details as possible to get feedback/acceptance on your PR quickly

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 #)

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file; or

(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or

(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.

(d) I understand and agree that this project and the contribution
are public and that a record of the contribution (including all
personal information I submit with it, including my sign-off) is
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #1357 (621b07e) into opendistro-1.9 (68151b0) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@                 Coverage Diff                  @@
##             opendistro-1.9    #1357      +/-   ##
====================================================
+ Coverage             64.03%   64.10%   +0.06%     
- Complexity             3172     3186      +14     
====================================================
  Files                   241      241              
  Lines                 16942    16962      +20     
  Branches               3042     3049       +7     
====================================================
+ Hits                  10849    10873      +24     
+ Misses                 4539     4538       -1     
+ Partials               1554     1551       -3     

Impacted Files	Coverage Δ
...est/validation/AbstractConfigurationValidator.java	83.89% <100.00%> (+2.49%)	⬆️
...security/configuration/DlsFlsFilterLeafReader.java	58.16% <0.00%> (-0.75%)	⬇️
...search/security/tools/OpenDistroSecurityAdmin.java	47.52% <0.00%> (+0.26%)	⬆️
.../dlic/auth/ldap2/LDAPConnectionFactoryFactory.java	57.25% <0.00%> (+0.76%)	⬆️
...earch/security/auditlog/impl/AbstractAuditLog.java	75.00% <0.00%> (+1.07%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 68151b0...621b07e. Read the comment docs.