ugprade moreterms index to 6.0.0

lucene/backward-codecs/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java

@@ -1306,7 +1306,7 @@ public class TestBackwardsCompatibility extends LuceneTestCase {
     dir.close();
   }
 
-  public static final String moreTermsIndex = "moreterms.5.0.0.zip";
+  public static final String moreTermsIndex = "moreterms.6.0.0.zip";
 
   public void testMoreTerms() throws Exception {
     Path oldIndexDir = createTempDir("moreterms");