/*
 *  call-seq:
 *     iw.merge_factor = merge_factor -> merge_factor
 *
 *  Set the merge_factor parameter
 */
static VALUE
frt_iw_set_merge_factor(VALUE self, VALUE rval)
{
    IndexWriter *iw = (IndexWriter *)DATA_PTR(self);
    iw->config.merge_factor = FIX2INT(rval);
    return rval;
}