add 45 indices to TestBackCompat; fix back-compat bug in Lucene45DVProducer

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1563251 13f79535-47bb-0310-9956-ffa450edef68

lucene/core/src/java/org/apache/lucene/codecs/lucene45/Lucene45DocValuesProducer.java

@@ -104,7 +104,7 @@ public class Lucene45DocValuesProducer extends DocValuesProducer implements Clos
       String dataName = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, dataExtension);
       data = state.directory.openInput(dataName, state.context);
       final int version2 = CodecUtil.checkHeader(data, dataCodec, 
-                                                 Lucene45DocValuesFormat.VERSION_CURRENT,
+                                                 Lucene45DocValuesFormat.VERSION_START,
                                                  Lucene45DocValuesFormat.VERSION_CURRENT);
       if (version != version2) {
         throw new CorruptIndexException("Format versions mismatch");

lucene/core/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java

@@ -164,8 +164,8 @@ public class TestBackwardsCompatibility extends LuceneTestCase {
                                     "42.cfs",
                                     "42.nocfs",
                                     // TODO: these are on 4x, but something is wrong (they seem to be a too old DV format):
-                                    //"45.cfs",
-                                    //"45.nocfs",
+                                    "45.cfs",
+                                    "45.nocfs",
                                     "461.cfs",
                                     "461.nocfs",
   };