@After
  public void tearDown() throws Exception {
    super.tearDown();
    replicaEngine.close();
    storeReplica.close();

    engine.close();
    store.close();

    if (threadPool != null) {
      threadPool.shutdownNow();
    }
  }
 @Before
 public void setUp() throws Exception {
   super.setUp();
   defaultSettings =
       ImmutableSettings.builder()
           .put(RobinEngine.INDEX_COMPOUND_ON_FLUSH, getRandom().nextBoolean())
           .build(); // TODO randomize more settings
   threadPool = new ThreadPool();
   store = createStore();
   store.deleteContent();
   storeReplica = createStoreReplica();
   storeReplica.deleteContent();
   engineSettingsService = new IndexSettingsService(shardId.index(), EMPTY_SETTINGS);
   engine = createEngine(engineSettingsService, store, createTranslog());
   engine.start();
   replicaSettingsService = new IndexSettingsService(shardId.index(), EMPTY_SETTINGS);
   replicaEngine = createEngine(replicaSettingsService, storeReplica, createTranslogReplica());
   replicaEngine.start();
 }