@Override
    public Object getDeserializedValue() {
      throw new UnsupportedOperationException();
    }
returns a new InMemoryIndexStorageEntry with current index key and its next value which is
the next RE in the collection. Make sure hasNext() has been called before calling this method
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/MemoryIndexStore.java