lucene 4: Fixed compile error

src/main/java/org/elasticsearch/search/lookup/FieldsLookup.java

@@ -159,8 +159,6 @@ public class FieldsLookup implements Map {
                 data.doc(fieldVisitor.createDocument());
             } catch (IOException e) {
                 throw new ElasticSearchParseException("failed to load field [" + name + "]", e);
-            } finally {
-                fieldVisitor.reset();
             }
         }
         return data;