final SegmentInfos sourceSegmentsClone = merge.segmentsClone;
final int numSegmentsToMerge = sourceSegmentsClone.size();
assert merge.increfDone;
merge.increfDone = false;
for(int i=0;i<numSegmentsToMerge;i++) {
final SegmentInfo previousInfo = sourceSegmentsClone.info(i);
// Decref all files for this SegmentInfo (this
// matches the incref in mergeInit):
if (previousInfo.dir == directory)
deleter.decRef(previousInfo.files());
}