final ProgressLogger progress = new ProgressLogger(log, 10000);
final CloseableIterator<VariantContext> iterator = fileReader.iterator();
while (iterator.hasNext()) {
final VariantContext context = iterator.next();
vcfWriter.add(context);
progress.record(context.getChr(), context.getStart());
}
CloserUtil.close(iterator);
CloserUtil.close(fileReader);
vcfWriter.close();