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
randomBoolean()
                )
            ) {
                assertNotNull(context);
            }
            searchSourceBuilder.scriptField(
                "anotherScriptField",
                new Script(ScriptType.INLINE, MockScriptEngine.NAME, CustomScriptPlugin.DUMMY_SCRIPT, Collections.emptyMap())
            );
            IllegalArgumentException ex = expectThrows(
                IllegalArgumentException.class,
                () -> service.createContext(reader, request, mock(SearchShardTask.class), ResultsType.NONE, randomBoolean())
            );
            assertEquals(
                "Trying to retrieve too many script_fields. Must be less than or equal to: ["
                    + maxScriptFields
                    + "] but was ["
                    + (maxScriptFields + 1)
                    + "]. This limit can be set by changing the [index.max_script_fields] index level setting.",
                ex.getMessage()
            );
        }
    }
    public void testIgnoreScriptfieldIfSizeZero() throws IOException {
        createIndex("index");
        final SearchService service = getInstanceFromNode(SearchService.class);
        final IndicesService indicesService = getInstanceFromNode(IndicesService.class);
        final IndexService indexService = indicesService.indexServiceSafe(resolveIndex("index"));
        final IndexShard indexShard = indexService.getShard(0);
        SearchRequest searchRequest = new SearchRequest().allowPartialSearchResults(true);