[Backport 2.x] Update 2.4.1 release notes

[opensearch-trigger-bot]

Backport 1710786 from #5552.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/8041/
• CommitID: 4bd2e8b

[codecov-commenter]

Codecov Report

Merging #5555 (4bd2e8b) into 2.x (f2b725a) will decrease coverage by 0.01%.
The diff coverage is 89.39%.

@@             Coverage Diff              @@
##                2.x    #5555      +/-   ##
============================================
- Coverage     70.68%   70.66%   -0.02%     
+ Complexity    58394    58332      -62     
============================================
  Files          4704     4697       -7     
  Lines        279209   278913     -296     
  Branches      40778    40738      -40     
============================================
- Hits         197347   197100     -247     
+ Misses        65401    65381      -20     
+ Partials      16461    16432      -29     

Impacted Files	Coverage Δ
...c/main/java/org/opensearch/bootstrap/Security.java	33.09% <0.00%> (ø)
...org/opensearch/common/settings/SettingsModule.java	86.17% <86.95%> (ø)
...in/java/org/opensearch/indices/IndicesService.java	69.24% <88.33%> (ø)
server/src/main/java/org/opensearch/node/Node.java	86.76% <93.10%> (ø)
...tion/admin/cluster/state/ClusterStateResponse.java	73.68% <100.00%> (ø)
...search/common/settings/AbstractScopedSettings.java	89.48% <100.00%> (ø)
.../src/main/java/org/opensearch/env/Environment.java	87.69% <100.00%> (ø)
...in/java/org/opensearch/plugins/PluginsService.java	85.23% <100.00%> (ø)
...ava/org/opensearch/transport/TransportService.java	82.50% <100.00%> (ø)
...pensearch/client/cluster/RemoteConnectionInfo.java	0.00% <0.00%> (-75.00%)	⬇️
... and 544 more

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