import static org.apache.lucene.store.NoLockFactory.getNoLockFactory;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
<BUG>import java.util.Calendar;
import java.util.Set;</BUG>
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
import org.apache.commons.io.IOUtils;

import static org.apache.lucene.store.NoLockFactory.getNoLockFactory;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
import org.apache.commons.io.IOUtils;
