Mute DateHistogramAggregatorTests.testAsSubAgg

(cherry picked from commit 4d050a7)

server/src/test/java/org/elasticsearch/search/aggregations/bucket/histogram/DateHistogramAggregatorTests.java

@@ -171,6 +171,7 @@ public void testMatchAllDocs() throws IOException {
         );
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/57168")
     public void testAsSubAgg() throws IOException {
         KeywordFieldMapper.KeywordFieldType k1ft = new KeywordFieldMapper.KeywordFieldType();
         k1ft.setName("k1");
@@ -230,7 +231,7 @@ public void testAsSubAgg() throws IOException {
             assertThat(ak1adh.getBuckets().stream().map(bucket -> bucket.getKey().toString()).collect(toList()),
                 equalTo(org.elasticsearch.common.collect.List.of("2020-01-01T00:00Z", "2021-01-01T00:00Z")
             ));
-    
+
             StringTerms.Bucket b = terms.getBucketByKey("b");
             StringTerms bk1 = b.getAggregations().get("k1");
             StringTerms.Bucket bk1a = bk1.getBucketByKey("a");