Add release notes for 2.11

[noCharger]

Description

1. Add the release note from 2.11 branch https://github.com/opensearch-project/OpenSearch/blob/2.11/release-notes/opensearch.release-notes-2.11.0.md
2. Update CHANGELOG accordingly

Check List

• Commits are signed per the DCO using --signoff

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.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: ❌
• URL:
• CommitID: bcd65df
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

@noCharger said there's a mistake in this PR

[github-actions]

Compatibility status:

Checks if related components are compatible with change 42009ae

Incompatible components

Incompatible components: [https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/ml-commons.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/reporting.git]

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/27794/
• CommitID: 2786f20
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/27796/
• CommitID: d7abf13
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[noCharger]

Gradle Check (Jenkins) Run Completed with:

• RESULT: ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/27796/
• CommitID: d7abf13
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

DEVELOPER_GUIDE.md#flaky-tests) unrelated to your change?

https://build.ci.opensearch.org/job/gradle-check/27796/console

Tests with failures:
 - org.opensearch.search.aggregations.metrics.CardinalityWithRequestBreakerIT.testRequestBreaker {p0={"search.concurrent_segment_search.enabled":"true"}}
 - org.opensearch.search.aggregations.metrics.CardinalityWithRequestBreakerIT.classMethod
 - org.opensearch.search.suggest.CompletionSuggestSearchIT.testSkipDuplicates {p0={"search.concurrent_segment_search.enabled":"false"}}
 - org.opensearch.search.suggest.CompletionSuggestSearchIT.testSkipDuplicates {p0={"search.concurrent_segment_search.enabled":"true"}}

Flaky test #10154

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/27830/
• CommitID: d7abf13

[codecov]

Codecov Report

Merging #10605 (42009ae) into 2.x (52018ec) will increase coverage by 0.03%.
Report is 6 commits behind head on 2.x.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##                2.x   #10605      +/-   ##
============================================
+ Coverage     70.84%   70.87%   +0.03%     
- Complexity    58489    58516      +27     
============================================
  Files          4831     4830       -1     
  Lines        276413   276440      +27     
  Branches      40581    40586       +5     
============================================
+ Hits         195822   195936     +114     
+ Misses        63872    63807      -65     
+ Partials      16719    16697      -22     

Files	Coverage Δ
...rg/opensearch/common/settings/ClusterSettings.java	92.85% <ø> (ø)
...earch/index/store/RemoteSegmentStoreDirectory.java	88.88% <100.00%> (+0.03%)	⬆️
server/src/main/java/org/opensearch/node/Node.java	85.69% <ø> (-0.02%)	⬇️
...main/java/org/opensearch/search/SearchService.java	72.60% <100.00%> (+0.03%)	⬆️
...ensearch/search/internal/ContextIndexSearcher.java	73.37% <100.00%> (ø)
...search/search/internal/MaxTargetSliceSupplier.java	92.30% <100.00%> (ø)
.../org/opensearch/search/internal/SearchContext.java	41.50% <ø> (ø)
...nsearch/search/internal/FilteredSearchContext.java	8.69% <0.00%> (-0.08%)	⬇️
...va/org/opensearch/search/DefaultSearchContext.java	77.41% <33.33%> (-0.48%)	⬇️
...nsearch/action/ingest/SimulatePipelineRequest.java	71.73% <53.84%> (+14.59%)	⬆️
... and 1 more

... and 459 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/27875/
• CommitID: 42009ae
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/27878/
• CommitID: 42009ae
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/27896/
• CommitID: 42009ae