Unmute test DeleteByQueryConcurrentTests

Unmute DeleteByQueryConcurrentTests
testConcurrentDeleteByQueriesOnDifferentDocs test.

LUCENE-9449 introduced a bug in sorting on _doc,
which resulted in failure of this test. As Lucene bug
has been fixed, this reenables the test.

Closes #62609

modules/reindex/src/test/java/org/elasticsearch/index/reindex/DeleteByQueryConcurrentTests.java

@@ -35,7 +35,6 @@ import static org.hamcrest.Matchers.equalTo;
 
 public class DeleteByQueryConcurrentTests extends ReindexTestCase {
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/62609")
     public void testConcurrentDeleteByQueriesOnDifferentDocs() throws Throwable {
         final Thread[] threads =  new Thread[scaledRandomIntBetween(2, 5)];
         final long docs = randomIntBetween(1, 50);