Unmute FullClusterRestartIT#testClosedIndices

Fixed in #39566
Closes #39576

Author: dnhatn

qa/full-cluster-restart/src/test/java/org/elasticsearch/upgrades/FullClusterRestartIT.java

@@ -1031,7 +1031,6 @@ public void testSoftDeletes() throws Exception {
      * This test creates an index in the old cluster and then closes it. When the cluster is fully restarted in a newer version,
      * it verifies that the index exists and is replicated if the old version supports replication.
      */
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/39576")
     public void testClosedIndices() throws Exception {
         if (isRunningAgainstOldCluster()) {
             createIndex(index, Settings.builder()