diff --git a/Classes/Connection/Elasticsearch/DocumentFactory.php b/Classes/Connection/Elasticsearch/DocumentFactory.php
index ca90ebe..d570789 100644
--- a/Classes/Connection/Elasticsearch/DocumentFactory.php
+++ b/Classes/Connection/Elasticsearch/DocumentFactory.php
@@ -57,6 +57,7 @@ class DocumentFactory implements Singleton
         }
 
         $identifier = $document['search_identifier'];
+        unset($document['search_identifier']);
 
         $this->logger->debug(
             sprintf('Convert %s %u to document.', $documentType, $identifier),