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
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchRequest.source(searchSourceBuilder);
        searchSourceBuilder.scriptField(
            "field" + 0,
            new Script(ScriptType.INLINE, MockScriptEngine.NAME, CustomScriptPlugin.DUMMY_SCRIPT, Collections.emptyMap())
        );
        searchSourceBuilder.size(0);
        final ShardSearchRequest request = new ShardSearchRequest(
            OriginalIndices.NONE,
            searchRequest,
            indexShard.shardId(),
            0,
            1,
            AliasFilter.EMPTY,
            1.0f,
            -1,
            null
        );
        try (
            ReaderContext reader = createReaderContext(indexService, indexShard);
            SearchContext context = service.createContext(reader, request, mock(SearchShardTask.class), ResultsType.NONE, randomBoolean())
        ) {
            assertEquals(0, context.scriptFields().fields().size());
        }
    }
    /**
     * test that creating more than the allowed number of scroll contexts throws an exception
     */
    public void testMaxOpenScrollContexts() throws Exception {
        createIndex("index");