diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/object/RootObjectMapper.java b/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/object/RootObjectMapper.java
index a711540f584..c1e65fd391d 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/object/RootObjectMapper.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/object/RootObjectMapper.java
@@ -256,7 +256,7 @@ public class RootObjectMapper extends ObjectMapper {
         }
 
         if (dateDetection != Defaults.DATE_DETECTION) {
-            builder.field("date_detection", Defaults.DATE_DETECTION);
+            builder.field("date_detection", dateDetection);
         }
     }
 }