diff --git a/Classes/Connection/Elasticsearch/DocumentFactory.php b/Classes/Connection/Elasticsearch/DocumentFactory.php
index 99d29e5..390c592 100644
--- a/Classes/Connection/Elasticsearch/DocumentFactory.php
+++ b/Classes/Connection/Elasticsearch/DocumentFactory.php
@@ -61,7 +61,10 @@ class DocumentFactory implements Singleton
         $identifier = $document['search_identifier'];
         unset($document['search_identifier']);
 
-        $this->logger->debug('Convert document to document', [$identifier, $document]);
+        $this->logger->debug(
+            sprintf('Convert %s %u to document.', $documentType, $identifier),
+            [$identifier, $document]
+        );
         return new \Elastica\Document($identifier, $document);
     }