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
service.executeQueryPhase(
            new QuerySearchRequest(null, context.id(), request, new AggregatedDfs(Map.of(), Map.of(), 10)),
            new SearchShardTask(42L, "", "", "", null, Collections.emptyMap()),
            plainActionFuture
        );
        plainActionFuture.actionGet();
        assertThat(((TestRewriteCounterQueryBuilder) request.source().query()).asyncRewriteCount, equalTo(1));
        final ShardSearchContextId contextId = context.id();
        assertTrue(service.freeReaderContext(contextId));
    }
    public void testEnableSearchWorkerThreads() throws IOException {
        IndexService indexService = createIndex("index", Settings.EMPTY);
        IndexShard indexShard = indexService.getShard(0);
        ShardSearchRequest request = new ShardSearchRequest(
            OriginalIndices.NONE,
            new SearchRequest().allowPartialSearchResults(randomBoolean()),
            indexShard.shardId(),
            0,
            indexService.numberOfShards(),
            AliasFilter.EMPTY,
            1f,
            System.currentTimeMillis(),
            null
        );
        try (ReaderContext readerContext = createReaderContext(indexService, indexShard)) {
            SearchService service = getInstanceFromNode(SearchService.class);
            SearchShardTask task = new SearchShardTask(0, "type", "action", "description", null, emptyMap());
            {
                SearchContext searchContext = service.createContext(readerContext, request, task, ResultsType.DFS, randomBoolean());
                assertNotNull(searchContext.searcher().getExecutor());