File folder = new File(dir);
try {
Directory dest = FSDirectory.open(folder);
IndexFileNameFilter filter = IndexFileNameFilter.getFilter();
for (String file : this.index.listAll()) {
if (filter.accept(null, file)) {
this.index.copy(dest, file, file);
}
}
} catch (IOException ioe) {
jlog.severe("Couldn't copy index:\n\t" + ioe);