Failed on my PR but reproducible on main.

**Build scan:**
https://gradle-enterprise.elastic.co/s/ihsa6rp45s7pi/tests/:server:test/org.elasticsearch.search.internal.ContextIndexSearcherTests/testContextIndexSearcherDenseWithDeletions

**Reproduction line:**
```
./gradlew ':server:test' --tests "org.elasticsearch.search.internal.ContextIndexSearcherTests.testContextIndexSearcherDenseWithDeletions" -Dtests.seed=CC72C52A61B0EED9 -Dtests.locale=en-ZA -Dtests.timezone=Etc/GMT+12 -Druntime.java=20
```

**Applicable branches:**
main

**Reproduces locally?:**
Yes

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.search.internal.ContextIndexSearcherTests&tests.test=testContextIndexSearcherDenseWithDeletions

**Failure excerpt:**
```
java.lang.AssertionError: 
Expected: an instance of org.apache.lucene.util.FixedBitSet
     but: <org.elasticsearch.lucene.util.MatchAllBitSet@304c196f> is a org.elasticsearch.lucene.util.MatchAllBitSet

  at __randomizedtesting.SeedInfo.seed([CC72C52A61B0EED9:DC24AC130B9BB9E7]:0)
  at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
  at org.junit.Assert.assertThat(Assert.java:956)
  at org.junit.Assert.assertThat(Assert.java:923)
  at org.elasticsearch.search.internal.ContextIndexSearcherTests.doTestContextIndexSearcher(ContextIndexSearcherTests.java:229)
  at org.elasticsearch.search.internal.ContextIndexSearcherTests.testContextIndexSearcherDenseWithDeletions(ContextIndexSearcherTests.java:178)
  at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
  at java.lang.reflect.Method.invoke(Method.java:578)
  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: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$1.evaluate(TestRuleMarkFailure.java:44)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$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:1623)

```
server/src/test/java/org/elasticsearch/search/internal/ContextIndexSearcherTests.java
int numThrowingLeafSlices = randomIntBetween(1, 3);
                    for (int i = 0; i < numThrowingLeafSlices; i++) {
                        LeafSlice throwingLeafSlice = leafSlices[randomIntBetween(0, Math.min(leafSlices.length, numAvailableThreads) - 1)];
                        throwingLeaves.add(randomFrom(throwingLeafSlice.leaves));
                    }
                    Query query = new TestQuery() {
                        @Override
                        public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) {
                            return new ConstantScoreWeight(this, boost) {
                                @Override
                                public Scorer scorer(LeafReaderContext context) throws IOException {
                                    if (throwingLeaves.contains(context)) {
                                        
                                        throw new IOException();
                                    }
                                    scoredLeaves.add(context);
                                    return new ConstantScoreScorer(
                                        this,
                                        boost,
                                        ScoreMode.COMPLETE,
                                        DocIdSetIterator.all(context.reader().maxDoc())
                                    );
                                }
                                @Override
                                public boolean isCacheable(LeafReaderContext ctx) {
                                    return false;
                                }
                            };
                        }
                    };