diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequest.java b/modules/elasticsearch/src/main/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequest.java
index 535f67bbe3e..3b214667d38 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequest.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequest.java
@@ -57,7 +57,7 @@ public class PutMappingRequest extends MasterNodeOperationRequest {
 
     private TimeValue timeout = new TimeValue(10, TimeUnit.SECONDS);
 
-    private boolean ignoreConflicts = true;
+    private boolean ignoreConflicts = false;
 
     PutMappingRequest() {
     }