Returns nested resources of this class. The result should be a point-in-time snapshot (to avoid race conditions).
Consume all terms in a sorted order.
Get the newest doc id of the deleted term.
Visible for testing.
Just for test, not efficient.
Put the newest doc id of the deleted term.
Return the memory usage of this object in bytes. Negative values are illegal.
Used for BufferedUpdates.VERBOSE_DELETES.