diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/xcontent/StringFieldMapper.java b/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/xcontent/StringFieldMapper.java
index a85d5a5081b..137c5a4fdac 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/xcontent/StringFieldMapper.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/xcontent/StringFieldMapper.java
@@ -89,10 +89,6 @@ public class StringFieldMapper extends AbstractFieldMapper<String> implements In
         }
     }
 
-    static class FieldWrapper {
-        public Field field;
-    }
-
     private String nullValue;
 
     private Boolean includeInAll;