
This object can be used to update a free text index by feeding document
information into it using vt_batch_d_id to set the free text document ID and
vt_batch_feed to feed actual words.

This object may not be assigned to other variables and may only be passed as
an inout parameter.

The batch is applied to the index by calling the
VT_BATCH_PROCESS_<table>_<column> function generated
by CREATE TEXT INDEX.
