Add awaits fix for HasChildQueryBuilderTests

These tests are failing since
569d0c0. This commit adds an awaits fix
for them until they can be addressed.

Author: jasontedor

modules/parent-join/src/test/java/org/elasticsearch/join/query/HasChildQueryBuilderTests.java

@@ -31,6 +31,7 @@
 import org.apache.lucene.search.join.ScoreMode;
 import org.apache.lucene.search.similarities.PerFieldSimilarityWrapper;
 import org.apache.lucene.search.similarities.Similarity;
+import org.apache.lucene.util.LuceneTestCase;
 import org.elasticsearch.Version;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.common.Strings;
@@ -72,6 +73,7 @@
 import static org.hamcrest.CoreMatchers.instanceOf;
 import static org.hamcrest.CoreMatchers.notNullValue;
 
+@LuceneTestCase.AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/29362")
 public class HasChildQueryBuilderTests extends AbstractQueryTestCase<HasChildQueryBuilder> {
 
     private static final String TYPE = "_doc";