private void crash(final IndexWriter writer) throws IOException {
final MockDirectoryWrapper dir = (MockDirectoryWrapper) writer.getDirectory();
ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler) writer.getConfig().getMergeScheduler();
cms.sync();
dir.crash();
cms.sync();
dir.clearCrash();
}
public void testCrashWhileIndexing() throws IOException {