muted test

Relates to #38835

x-pack/qa/rolling-upgrade-multi-cluster/src/test/java/org/elasticsearch/upgrades/CcrRollingUpgradeIT.java

@@ -21,6 +21,11 @@ import static org.hamcrest.Matchers.equalTo;
 
 public class CcrRollingUpgradeIT extends AbstractMultiClusterUpgradeTestCase {
 
+    public void test() {
+        // dummy test otherwise test run fails when both tests are ignored.
+    }
+
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/38835")
     public void testIndexFollowing() throws Exception {
         logger.info("clusterName={}, upgradeState={}", clusterName, upgradeState);