diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexMapping.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexMapping.php
index 58f50faecd..0e154f832f 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexMapping.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexMapping.php
@@ -76,10 +76,6 @@ class ComplexMapping extends FieldMapping
             $properties[$name] = $child->toArray();
         }
 
-        if ($this->childKey) {
-            return [$this->childKey => $properties];
-        }
-
         return $properties;
     }
 }
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexPropertiesMapping.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexPropertiesMapping.php
index c3e48be954..af1487da15 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexPropertiesMapping.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/ComplexPropertiesMapping.php
@@ -24,7 +24,7 @@ class ComplexPropertiesMapping extends ComplexMapping
     /**
      * @return array
      */
-    public function toArray()
+    public function getProperties()
     {
         return [ 'properties' => parent::getProperties() ];
     }