[Backport 2.x] Fix cluster default initialization Part 1 (#4002)

[willyborankin]

Backport b0d26dd from #4002

[codecov]

Codecov Report

Attention: Patch coverage is 86.86869% with 39 lines in your changes are missing coverage. Please review.

Project coverage is 66.10%. Comparing base (c0c4529) to head (951ca2e).

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x    #4256      +/-   ##
==========================================
+ Coverage   65.81%   66.10%   +0.28%     
==========================================
  Files         296      300       +4     
  Lines       21258    21531     +273     
  Branches     3471     3497      +26     
==========================================
+ Hits        13992    14234     +242     
- Misses       5523     5541      +18     
- Partials     1743     1756      +13     

Files	Coverage Δ
...g/opensearch/security/support/ConfigConstants.java	95.23% <ø> (ø)
.../org/opensearch/security/support/ConfigHelper.java	88.46% <ø> (ø)
...ecurityconf/impl/SecurityDynamicConfiguration.java	79.52% <0.00%> (+0.95%)	⬆️
.../opensearch/security/support/YamlConfigReader.java	96.66% <96.66%> (ø)
.../opensearch/security/OpenSearchSecurityPlugin.java	84.32% <70.00%> (-0.18%)	⬇️
...nsearch/security/support/SecurityIndexHandler.java	96.22% <96.22%> (ø)
.../org/opensearch/security/state/SecurityConfig.java	78.94% <78.94%> (ø)
...rg/opensearch/security/state/SecurityMetadata.java	78.37% <78.37%> (ø)
...ecurity/configuration/ConfigurationRepository.java	74.50% <81.33%> (+1.64%)	⬆️

... and 5 files with indirect coverage changes