[BUG] Test case org.opensearch.search.aggregations.bucket.nested.ReverseNestedAggregatorTests.testNestedUnderTerms is flaky

[reta]

Describe the bug

The test case org.opensearch.search.aggregations.bucket.nested.ReverseNestedAggregatorTests.testNestedUnderTerms is flaky:

java.lang.AssertionError
	at __randomizedtesting.SeedInfo.seed([A4DC011F89883005:E6666C14BB603A7D]:0)
	at org.opensearch.search.aggregations.bucket.nested.ReverseNestedAggregator$1.collect(ReverseNestedAggregator.java:100)
	at org.opensearch.search.aggregations.bucket.BestBucketsDeferringCollector.prepareSelectedBuckets(BestBucketsDeferringCollector.java:219)
	at org.opensearch.search.aggregations.bucket.DeferableBucketAggregator.beforeBuildingBuckets(DeferableBucketAggregator.java:119)
	at org.opensearch.search.aggregations.bucket.BucketsAggregator.buildSubAggsForBuckets(BucketsAggregator.java:217)
	at org.opensearch.search.aggregations.bucket.BucketsAggregator.buildSubAggsForAllBuckets(BucketsAggregator.java:286)
	at org.opensearch.search.aggregations.bucket.terms.NumericTermsAggregator.access$100(NumericTermsAggregator.java:81)
	at org.opensearch.search.aggregations.bucket.terms.NumericTermsAggregator$StandardTermsResultStrategy.buildSubAggs(NumericTermsAggregator.java:311)
	at org.opensearch.search.aggregations.bucket.terms.NumericTermsAggregator$StandardTermsResultStrategy.buildSubAggs(NumericTermsAggregator.java:291)
	at org.opensearch.search.aggregations.bucket.terms.NumericTermsAggregator$ResultStrategy.buildAggregations(NumericTermsAggregator.java:211)
	at org.opensearch.search.aggregations.bucket.terms.NumericTermsAggregator.buildAggregations(NumericTermsAggregator.java:150)
	at org.opensearch.search.aggregations.bucket.BucketsAggregator.buildSubAggsForBuckets(BucketsAggregator.java:220)
	at org.opensearch.search.aggregations.bucket.BucketsAggregator.buildAggregationsForSingleBucket(BucketsAggregator.java:359)
	at org.opensearch.search.aggregations.bucket.nested.NestedAggregator.buildAggregations(NestedAggregator.java:152)
	at org.opensearch.search.aggregations.Aggregator.buildTopLevel(Aggregator.java:205)
	at org.opensearch.search.aggregations.AggregatorTestCase.searchAndReduce(AggregatorTestCase.java:567)
	at org.opensearch.search.aggregations.AggregatorTestCase.searchAndReduce(AggregatorTestCase.java:499)
	at org.opensearch.search.aggregations.AggregatorTestCase.testCase(AggregatorTestCase.java:637)
	at org.opensearch.search.aggregations.bucket.nested.ReverseNestedAggregatorTests.testNestedUnderTerms(ReverseNestedAggregatorTests.java:247)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1750)
	at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:938)
	at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:974)
	at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:988)
	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:48)
	at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
	at org.apache.lucene.tests.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
	at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
	at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
	at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
	at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:817)
	at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:468)
	at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:947)
	at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:832)
	at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:883)
	at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:894)
	at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
	at org.apache.lucene.tests.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:38)
	at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
	at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
	at org.apache.lucene.tests.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
	at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
	at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
	at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
	at org.apache.lucene.tests.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:47)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
	at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
	at java.base/java.lang.Thread.run(Thread.java:1583)

Related component

Search:Aggregations

To Reproduce

./gradlew ':server:test' --tests "org.opensearch.search.aggregations.bucket.nested.ReverseNestedAggregatorTests.testNestedUnderTerms" -Dtests.seed=A4DC011F89883005

Expected behavior

The test must always pass

Additional Details

Plugins
Standard

Screenshots
If applicable, add screenshots to help explain your problem.

Host/Environment (please complete the following information):

• CI

Additional context
https://build.ci.opensearch.org/job/gradle-check/38684/testReport/junit/org.opensearch.search.aggregations.bucket.nested/ReverseNestedAggregatorTests/testNestedUnderTerms/

[peternied]

[Triage - attendees 1 2 3 4 5 6 7 8]
@reta Thanks for creating this issue

[getsaurabh02]

@sandeshkr419 volunteered to take a stab at this one. cc: @jed326 to provide any insights