final int termIndexInterval = TestUtil.nextInt(random(), 13, 27);
final Codec codec = Codec.getDefault();
final SegmentInfo si = new SegmentInfo(dir, Constants.LUCENE_MAIN_VERSION, SEGMENT, 10000, false, codec, null);
final SegmentWriteState state = new SegmentWriteState(InfoStream.getDefault(), dir, si, fieldInfos, termIndexInterval, null, newIOContext(random()));
final FieldsConsumer consumer = codec.postingsFormat().fieldsConsumer(state);
Arrays.sort(fields);
for (final FieldData field : fields) {
if (!allowPreFlex && codec instanceof Lucene3xCodec) {
// code below expects unicode sort order
continue;
}
field.write(consumer);
}
consumer.close();
}