code: public boolean isIndexed(FeatureIndexType type) {
  		boolean indexed = false;
  		if (type == null) {
  			indexed = isIndexed();
  		} else {
  			switch (type) {
  			case GEOPACKAGE:
  				indexed = featureTableIndex.isIndexed();
  				break;
  			case RTREE:
  				indexed = rTreeIndexTableDao.has();
  				break;
  			default:
  				throw new GeoPackageException("Unsupported FeatureIndexType: "
  						+ type);
  			}
  		}
  		return indexed;
  	}
docs: Is the feature table indexed in the provided type location
  
  @param type
  index location type
  @return true if indexed