Freezing an index should increase its index settings version

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/action/TransportFreezeIndexAction.java

@@ -183,6 +183,7 @@ public ClusterState execute(ClusterState currentState) {
  throw new IllegalStateException("index [" + index.getName() + "] is not closed");
  }
  final IndexMetaData.Builder imdBuilder = IndexMetaData.builder(meta);
+ imdBuilder.settingsVersion(meta.getSettingsVersion() + 1);
  final Settings.Builder settingsBuilder =
  Settings.builder()
  .put(currentState.metaData().index(index).getSettings())

x-pack/plugin/core/src/test/java/org/elasticsearch/index/engine/FrozenIndexTests.java

@@ -45,6 +45,7 @@
 import static org.elasticsearch.action.support.WriteRequest.RefreshPolicy.IMMEDIATE;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
+import static org.hamcrest.Matchers.equalTo;
 
 public class FrozenIndexTests extends ESSingleNodeTestCase {
 
@@ -324,4 +325,19 @@ public void testUnfreezeClosedIndex() throws ExecutionException, InterruptedExce
  assertEquals(IndexMetaData.State.OPEN,
  client().admin().cluster().prepareState().get().getState().metaData().index("idx").getState());
  }
+
+ public void testFreezeIndexIncreasesIndexSettingsVersion() throws ExecutionException, InterruptedException {
+ final String index = "test";
+ createIndex(index, Settings.builder().put("index.number_of_shards", 1).put("index.number_of_replicas", 0).build());
+ client().prepareIndex(index, "_doc").setSource("field", "value").execute().actionGet();
+
+ final long settingsVersion = client().admin().cluster().prepareState().get()
+ .getState().metaData().index(index).getSettingsVersion();
+
+ XPackClient xPackClient = new XPackClient(client());
+ assertAcked(xPackClient.freeze(new TransportFreezeIndexAction.FreezeRequest(index)));
+ assertIndexFrozen(index);
+ assertThat(client().admin().cluster().prepareState().get().getState().metaData().index(index).getSettingsVersion(),
+ equalTo(settingsVersion + 1));
+ }
 }