for (AtomicReaderContext ctx : indexReader.leaves()) {
mergeReaders.add(ctx.reader());
}
}
final IOContext context = new IOContext(new MergeInfo(numDocs, -1, true, -1));
// TODO: somehow we should fix this merge so it's
// abortable so that IW.close(false) is able to stop it
TrackingDirectoryWrapper trackingDir = new TrackingDirectoryWrapper(directory);