diff --git a/java-codegen/src/main/java/org/opensearch/client/codegen/NameSanitizer.java b/java-codegen/src/main/java/org/opensearch/client/codegen/NameSanitizer.java
index 83214e1031..2e44c30cae 100644
--- a/java-codegen/src/main/java/org/opensearch/client/codegen/NameSanitizer.java
+++ b/java-codegen/src/main/java/org/opensearch/client/codegen/NameSanitizer.java
@@ -15,6 +15,8 @@
 public class NameSanitizer {
     private static final Set<String> reservedWords = new HashSet<>() {
         {
+            add("default");
+            add("native");
             add("transient");
         }
     };