[Backport 2.x] Fix yml test {p0=indices.delete_index_template/10_basic} is flaky

[opensearch-trigger-bot]

Backport 4fe0358 from #15162.

[github-actions]

❌ Gradle check result for 18ad48a: 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?

[reta]

❌ Gradle check result for 18ad48a: FAILURE

@gaobinlong seems like another one? or unrelated?

java.lang.AssertionError: Failure at [ingest/70_bulk:181]: got unexpected warning header [
	299 OpenSearch-2.17.0-SNAPSHOT-18ad48a9e48c29ae4db4a7973394b7a6f7957e98 "index template [test_for_bulk_upsert_index_template] has index patterns [test_bulk_upsert_*] matching patterns from existing older templates [global] with patterns (global => [*]); this template [test_for_bulk_upsert_index_template] will take precedence during new index creation"
]

[1] https://build.ci.opensearch.org/job/gradle-check/44229/testReport/junit/org.opensearch.ingest.common/IngestCommonClientYamlTestSuiteIT/test__yaml_ingest_70_bulk_Test_bulk_upsert_honors_default_pipeline_and_final_pipeline_when_the_auto_created_index_matches_with_the_index_template_/

[gaobinlong]

❌ Gradle check result for 18ad48a: FAILURE

@gaobinlong seems like another one? or unrelated?

java.lang.AssertionError: Failure at [ingest/70_bulk:181]: got unexpected warning header [
	299 OpenSearch-2.17.0-SNAPSHOT-18ad48a9e48c29ae4db4a7973394b7a6f7957e98 "index template [test_for_bulk_upsert_index_template] has index patterns [test_bulk_upsert_*] matching patterns from existing older templates [global] with patterns (global => [*]); this template [test_for_bulk_upsert_index_template] will take precedence during new index creation"
]

[1] https://build.ci.opensearch.org/job/gradle-check/44229/testReport/junit/org.opensearch.ingest.common/IngestCommonClientYamlTestSuiteIT/test__yaml_ingest_70_bulk_Test_bulk_upsert_honors_default_pipeline_and_final_pipeline_when_the_auto_created_index_matches_with_the_index_template_/

This failure relates to another PR which added the test case, I've opened a new PR to fix it.

[github-actions]

✅ Gradle check result for 18ad48a: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.56%. Comparing base (e5e1bad) to head (18ad48a).
Report is 34 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15171      +/-   ##
============================================
+ Coverage     71.48%   71.56%   +0.07%     
- Complexity    62677    62784     +107     
============================================
  Files          5123     5129       +6     
  Lines        294480   294688     +208     
  Branches      42912    42941      +29     
============================================
+ Hits         210518   210883     +365     
+ Misses        66286    66133     -153     
+ Partials      17676    17672       -4     

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