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
final IndexShard indexShard = indexService.getShard(0);
        SearchRequest searchRequest = new SearchRequest().allowPartialSearchResults(true);
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchRequest.source(searchSourceBuilder);
        
        int maxScriptFields = indexService.getIndexSettings().getMaxScriptFields();
        for (int i = 0; i < maxScriptFields; i++) {
            searchSourceBuilder.scriptField(
                "field" + i,
                new Script(ScriptType.INLINE, MockScriptEngine.NAME, CustomScriptPlugin.DUMMY_SCRIPT, Collections.emptyMap())
            );
        }
        final ShardSearchRequest request = new ShardSearchRequest(
            OriginalIndices.NONE,
            searchRequest,
            indexShard.shardId(),
            0,
            1,
            AliasFilter.EMPTY,
            1.0f,
            -1,
            null
        );
        try (ReaderContext reader = createReaderContext(indexService, indexShard)) {
            try (
                SearchContext context = service.createContext(
                    reader,
                    request,
                    mock(SearchShardTask.class),
                    ResultsType.NONE,