Remove obsolete Lucene version constants.

src/main/java/com/gitblit/service/LuceneService.java

@@ -65,7 +65,6 @@ import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
 import org.apache.lucene.search.highlight.SimpleSpanFragmenter;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.FSDirectory;
-import org.apache.lucene.util.Version;
 import org.eclipse.jgit.diff.DiffEntry.ChangeType;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.FileMode;
@@ -125,8 +124,6 @@ public class LuceneService implements Runnable {
 	private static final String CONF_ALIAS = "aliases";
 	private static final String CONF_BRANCH = "branches";
 
-	private static final Version LUCENE_VERSION = Version.LUCENE_4_10_0;
-
 	private final Logger logger = LoggerFactory.getLogger(LuceneService.class);
 
 	private final IStoredSettings storedSettings;

src/main/java/com/gitblit/tickets/TicketIndexer.java

@@ -49,7 +49,6 @@ import org.apache.lucene.search.TopFieldDocs;
 import org.apache.lucene.search.TopScoreDocCollector;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.FSDirectory;
-import org.apache.lucene.util.Version;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -167,8 +166,6 @@ public class TicketIndexer {
 
 	private final Logger log = LoggerFactory.getLogger(getClass());
 
-	private final Version luceneVersion = Version.LUCENE_5_5_2;
-
 	private final File luceneDir;
 
 	private IndexWriter writer;