code: @Override
      public void setZIndex(float zIndex) {
          if (polygon != null) {
              polygon.setZIndex(zIndex);
          }
          for (Marker marker : markers) {
              marker.setZIndex(zIndex);
          }
          for (PolygonHoleMarkers hole : holes) {
              hole.setZIndex(zIndex);
          }
      }
docs: {@inheritDoc}