*
* @return
* @throws java.io.IOException
*/
public IntBigList getFrequencies() throws IOException {
IntBigList list = frequencies.get();
if (list == null) {
File frequenciesFile = new File(directory, String.format("%s-%s%s",
basename, field, DiskBasedIndex.FREQUENCIES_EXTENSION));
LOGGER.info("Loading term frequencies from file "+
frequenciesFile);