TEST: Add engine is closed as expected failure msg

This commit adds "engine is closed" as an expected failure message.
This change is due to elastic#33967 in which we might access a closed engine on
promotion.

Relates elastic#33967

Author: dnhatn

server/src/test/java/org/elasticsearch/index/replication/IndexLevelReplicationTests.java

@@ -381,7 +381,8 @@ public void testReplicaOperationWithConcurrentPrimaryPromotion() throws Exceptio
                     indexOnReplica(replicationRequest, shards, replica, primaryPrimaryTerm);
                     successFullyIndexed.set(true);
                 } catch (IllegalStateException ise) {
-                    assertThat(ise.getMessage(), either(containsString("is too old")).or(containsString("cannot be a replication target")));
+                    assertThat(ise.getMessage(), either(containsString("is too old"))
+                        .or(containsString("cannot be a replication target")).or(containsString("engine is closed")));
                 } catch (Exception e) {
                     throw new RuntimeException(e);
                 }