[TEST] Temporarily silence failing bwc test

More details at #17514

core/src/test/java/org/elasticsearch/bwcompat/OldIndexBackwardsCompatibilityIT.java

@@ -295,6 +295,7 @@ public class OldIndexBackwardsCompatibilityIT extends ESIntegTestCase {
         }
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/17514")
     public void testOldIndexes() throws Exception {
         setupCluster();