add packed bytes variant for strings/bytes

Author: kimchy

src/main/java/org/elasticsearch/index/fielddata/IndexFieldDataService.java

@@ -56,6 +56,7 @@ public class IndexFieldDataService extends AbstractIndexComponent {
 
         buildersByTypeAndFormat = MapBuilder.<Tuple<String, String>, IndexFieldData.Builder>newMapBuilder()
                 .put(Tuple.tuple("string", "concrete_bytes"), new ConcreteBytesRefIndexFieldData.Builder())
+                .put(Tuple.tuple("string", "packed_bytes"), new PackedBytesIndexFieldData.Builder())
                 .put(Tuple.tuple("float", "array"), new FloatArrayIndexFieldData.Builder())
                 .put(Tuple.tuple("double", "array"), new DoubleArrayIndexFieldData.Builder())
                 .put(Tuple.tuple("byte", "array"), new ByteArrayIndexFieldData.Builder())