Revert "Disable CcrRetentionLeaseIT#testRetentionLeasesAreNotBeingRenewedAfterRecoveryCompletes."

This reverts commit b8396c0a8e275c133d204aa0f9a04be1a1230d37.

x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/CcrRetentionLeaseIT.java

@@ -266,7 +266,6 @@ public class CcrRetentionLeaseIT extends CcrIntegTestCase {
 
     }
 
-    @AwaitsFix(bugUrl="https://github.com/elastic/elasticsearch/issues/39331")
     public void testRetentionLeasesAreNotBeingRenewedAfterRecoveryCompletes() throws Exception {
         final String leaderIndex = "leader";
         final int numberOfShards = randomIntBetween(1, 3);