SearchServiceTests.testIsParallelCollectionSupportedForResults fails intermittently

```
12:37:10 org.elasticsearch.search.SearchServiceTests > testIsParallelCollectionSupportedForResults FAILED
12:37:10     java.lang.AssertionError
12:37:10         at __randomizedtesting.SeedInfo.seed([4140C168DE8FB0BB:771A78D5E4B36180]:0)
12:37:10         at org.junit.Assert.fail(Assert.java:86)
12:37:10         at org.junit.Assert.assertTrue(Assert.java:41)
12:37:10         at org.junit.Assert.assertFalse(Assert.java:64)
12:37:10         at org.junit.Assert.assertFalse(Assert.java:74)
12:37:10         at org.elasticsearch.search.SearchServiceTests.testIsParallelCollectionSupportedForResults(SearchServiceTests.java:2096)
```

```
./gradlew ':server:test' --tests "org.elasticsearch.search.SearchServiceTests.testIsParallelCollectionSupportedForResults" -Dtests.seed=4140C168DE8FB0BB -Dtests.locale=es-SV -Dtests.timezone=Africa/Banjul -Druntime.java=20
```
server/src/test/java/org/elasticsearch/search/SearchServiceTests.java
)
                    );
                }
            } finally {
                
                client().admin()
                    .cluster()
                    .prepareUpdateSettings()
                    .setPersistentSettings(Settings.builder().putNull(QUERY_PHASE_PARALLEL_COLLECTION_ENABLED.getKey()).build())
                    .get();
                {
                    SearchContext searchContext = service.createContext(readerContext, request, task, ResultsType.QUERY, true);
                    ContextIndexSearcher searcher = searchContext.searcher();
                    assertNotNull(searcher.getExecutor());
                    final long priorExecutorTaskCount = executor.getCompletedTaskCount();
                    searcher.search(termQuery, new TotalHitCountCollectorManager());
                    assertBusy(
                        () -> assertEquals(
                            "The number of slices should be 1 for Query when QUERY_PHASE_PARALLEL_COLLECTION_ENABLED is disabled.",
                            1,
                            executor.getCompletedTaskCount() - priorExecutorTaskCount
                        )
                    );
                }
            }
        }
    }
    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/98534")
    public void testIsParallelCollectionSupportedForResults() {
        SearchSourceBuilder searchSourceBuilder = randomBoolean() ? null : new SearchSourceBuilder();