[Backport 2.x] Fix: remove unnecessary trailing/missing leading slash from REST paths.

[opensearch-trigger-bot]

Backport 4167ac5 from #11992.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 2c5b83d

Incompatible components

Incompatible components: [https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/performance-analyzer-rca.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/k-nn.git]

[github-actions]

❌ Gradle check result for 2c5b83d: FAILURE

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?

[dblock]

❌ Gradle check result for 2c5b83d: FAILURE

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?

org.opensearch.cluster.MinimumClusterManagerNodesIT.testThreeNodesNoClusterManagerBlock #10006
org.opensearch.remotestore.RemoteIndexPrimaryRelocationIT.testPrimaryRelocationWhileIndexing #9191
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testRefreshAfterCommit #8946
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterMultipleCommits #8638
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterCommit #8947
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterRefresh #8638

[github-actions]

❌ Gradle check result for 2c5b83d: FAILURE

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?

[dblock]

❌ Gradle check result for 2c5b83d: FAILURE

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?

org.opensearch.client.TasksIT.testGetValidTask looks transient
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testRefreshAfterCommit #8946
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterMultipleCommits #8638
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterCommit #8947
org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterRefresh #8638

[github-actions]

❕ Gradle check result for 2c5b83d: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testRefreshAfterCommit
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterRefresh
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterMultipleCommits
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterCommit
      1 org.opensearch.action.admin.cluster.node.tasks.ResourceAwareTasksTests.testTaskResourceTrackingDuringTaskCancellation

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c40fcff) 71.12% compared to head (2c5b83d) 71.26%.
Report is 2 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11995      +/-   ##
============================================
+ Coverage     71.12%   71.26%   +0.14%     
- Complexity    59361    59478     +117     
============================================
  Files          4891     4891              
  Lines        279940   279940              
  Branches      41055    41055              
============================================
+ Hits         199099   199498     +399     
+ Misses        63957    63587     -370     
+ Partials      16884    16855      -29     

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