// Clear each collection, to make previously returned collections empty.
    for (Collection<V> collection : map.values()) {
      collection.clear();
    }
    map.clear();
    totalSize = 0;
  }

  // Views

  /**
   * {@inheritDoc}
   *
   * <p>The returned collection is not serializable.
   */
  @Override
  public Collection<V> get(@ParametricNullness K key) {

labels.search_result_created=Created:
labels.search_result_last_modified=Last Modified:
labels.search_result_favorite=Like
labels.search_result_favorited=Liked
labels.search_click_count=Click Count ({0})
labels.search_click_views={0} views
labels.search_result_more=More..
labels.search_result_cache=Cache
labels.search_result_similar=Similar Results ({0})
labels.facet_label_title=Label
labels.facet_timestamp_title=Time

    // Clear each collection, to make previously returned collections empty.
    for (Collection<V> collection : map.values()) {
      collection.clear();
    }
    map.clear();
    totalSize = 0;
  }

  // Views

  /**
   * {@inheritDoc}
   *
   * <p>The returned collection is not serializable.
   */
  @Override
  public Collection<V> get(@ParametricNullness K key) {

    /** The key of the message: Click Count ({0}) */
    public static final String LABELS_search_click_count = "{labels.search_click_count}";

    /** The key of the message: {0} views */
    public static final String LABELS_search_click_views = "{labels.search_click_views}";

    /** The key of the message: More.. */
    public static final String LABELS_search_result_more = "{labels.search_result_more}";