next
Increments the iteration to the next BytesRef in the iterator. Returns the resulting BytesRef or null if the end of the iterator is reached. The returned BytesRef may be re-used across calls to next. After this method returns null, do not call it again: the results are undefined.
Return
the next BytesRef in the iterator or null if the end of the iterator is reached.
Throws
IOException
If there is a low-level I/O error.