diff --git a/src/Elasticsearch/Serializer/DocumentNormalizer.php b/src/Elasticsearch/Serializer/DocumentNormalizer.php
index eb60aa71a1b..753e28ea83d 100644
--- a/src/Elasticsearch/Serializer/DocumentNormalizer.php
+++ b/src/Elasticsearch/Serializer/DocumentNormalizer.php
@@ -34,6 +34,8 @@
 final class DocumentNormalizer extends ObjectNormalizer
 {
     public const FORMAT = 'elasticsearch';
+    
+    public const JSON_ENCODER_FORMAT = self::FORMAT;
 
     private $resourceMetadataFactory;