[Backport 2.x] Fix URLDecodeProcessor random test failure

[opensearch-trigger-bot]

Backport 152f3f4 from #5328.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.repositories.s3.RepositoryS3ClientYamlTestSuiteIT.test {yaml=repository_s3/20_repository_permanent_credentials/Snapshot and Restore with repository-s3 using permanent credentials}

• URL: https://build.ci.opensearch.org/job/gradle-check/7224/
• CommitID: 57814d6
  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-commenter]

Codecov Report

Merging #5340 (57814d6) into 2.x (d74d992) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x    #5340      +/-   ##
============================================
+ Coverage     70.67%   70.75%   +0.08%     
- Complexity    58308    58386      +78     
============================================
  Files          4700     4700              
  Lines        279111   279109       -2     
  Branches      40749    40749              
============================================
+ Hits         197254   197479     +225     
+ Misses        65377    65150     -227     
  Partials      16480    16480              

Impacted Files	Coverage Δ
...g/opensearch/ingest/common/URLDecodeProcessor.java	87.50% <100.00%> (+17.50%)	⬆️
...pensearch/client/cluster/RemoteConnectionInfo.java	0.00% <0.00%> (-70.00%)	⬇️
...a/org/opensearch/client/cluster/SniffModeInfo.java	0.00% <0.00%> (-62.50%)	⬇️
...ava/org/opensearch/action/NoSuchNodeException.java	0.00% <0.00%> (-50.00%)	⬇️
.../org/opensearch/client/indices/AnalyzeRequest.java	27.00% <0.00%> (-49.00%)	⬇️
...opensearch/persistent/PersistentTasksExecutor.java	22.22% <0.00%> (-40.75%)	⬇️
.../admin/cluster/reroute/ClusterRerouteResponse.java	60.00% <0.00%> (-40.00%)	⬇️
.../opensearch/client/cluster/RemoteInfoResponse.java	61.53% <0.00%> (-38.47%)	⬇️
...luster/routing/allocation/RoutingExplanations.java	62.06% <0.00%> (-37.94%)	⬇️
...java/org/opensearch/threadpool/ThreadPoolInfo.java	56.25% <0.00%> (-37.50%)	⬇️
... and 477 more

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[andrross]

      1 org.opensearch.repositories.s3.RepositoryS3ClientYamlTestSuiteIT.test {yaml=repository_s3/20_repository_permanent_credentials/Snapshot and Restore with repository-s3 using permanent credentials}

@reta FYI It looks like your fix is included here but this test was still flaky :(