MultiIndexFactory multiIndexFactory = new MultiIndexFactory(tx);
IndexFactory<String, Object> indexFactory = new BTreeIndexFactory<>();
try {
SortedIndex<String, Object> index = (SortedIndex<String, Object>) multiIndexFactory.openOrCreate(key, indexFactory);
Iterator<Entry<String, Object>> it = index.iterator();
while (it.hasNext()) {
Entry<String, Object> entry = it.next();