**Build scan:**
https://gradle-enterprise.elastic.co/s/uffxmc6e6bqtm/tests/:modules:parent-join:test/org.elasticsearch.join.aggregations.ParentToChildrenAggregatorTests/testBestDeferringCollectorWithSubAggOfChildrenAggNeedingScores

**Reproduction line:**
`./gradlew ':modules:parent-join:test' --tests "org.elasticsearch.join.aggregations.ParentToChildrenAggregatorTests.testBestDeferringCollectorWithSubAggOfChildrenAggNeedingScores" -Dtests.seed=4FE7CCF03CEAFE4F -Dtests.locale=uk -Dtests.timezone=Europe/Copenhagen -Druntime.java=17`

**Applicable branches:**
main

**Reproduces locally?:**
Yes

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.join.aggregations.ParentToChildrenAggregatorTests&tests.test=testBestDeferringCollectorWithSubAggOfChildrenAggNeedingScores

**Failure excerpt:**
```
java.lang.IndexOutOfBoundsException: Index 1 out of bounds for length 1

  at __randomizedtesting.SeedInfo.seed([4FE7CCF03CEAFE4F:A64E48CA989589B9]:0)
  at jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
  at jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
  at jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
  at java.util.Objects.checkIndex(Objects.java:359)
  at java.util.ArrayList.get(ArrayList.java:427)
  at org.elasticsearch.join.aggregations.ParentToChildrenAggregatorTests.testBestDeferringCollectorWithSubAggOfChildrenAggNeedingScores(ParentToChildrenAggregatorTests.java:249)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:568)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:946)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:982)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:996)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:44)
  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$1.evaluate(TestRuleMarkFailure.java:44)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:843)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:490)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:955)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:840)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:891)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:902)
  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$1.evaluate(TestRuleIgnoreTestSuites.java:47)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
  at java.lang.Thread.run(Thread.java:833)

```
modules/parent-join/src/test/java/org/elasticsearch/join/aggregations/ParentToChildrenAggregatorTests.java
);
        
        IndexSearcher indexSearcher = newSearcher(indexReader, false, true);
        testCase(new MatchAllDocsQuery(), indexSearcher, child -> {
            int expectedTotalChildren = 0;
            int expectedMinValue = Integer.MAX_VALUE;
            for (Tuple<Integer, Integer> expectedValues : expectedParentChildRelations.values()) {
                expectedTotalChildren += expectedValues.v1();
                expectedMinValue = Math.min(expectedMinValue, expectedValues.v2());
            }
            assertEquals(expectedTotalChildren, child.getDocCount());
            assertTrue(JoinAggregationInspectionHelper.hasValue(child));
            assertEquals(expectedMinValue, ((Min) child.getAggregations().get("in_child")).value(), Double.MIN_VALUE);
        });
        for (String parent : expectedParentChildRelations.keySet()) {
            testCase(new TermInSetQuery(IdFieldMapper.NAME, Uid.encodeId(parent)), indexSearcher, child -> {
                assertEquals((long) expectedParentChildRelations.get(parent).v1(), child.getDocCount());
                assertEquals(
                    expectedParentChildRelations.get(parent).v2(),
                    ((Min) child.getAggregations().get("in_child")).value(),
                    Double.MIN_VALUE
                );
            });
        }
        indexReader.close();
        directory.close();
    }
    public void testParentChildAsSubAgg() throws IOException {
        MappedFieldType kwd = new KeywordFieldMapper.KeywordFieldType("kwd", randomBoolean(), true, Collections.emptyMap());
        try (Directory directory = newDirectory()) {