diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/FieldToFieldMappingConverter.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/FieldToFieldMappingConverter.php
index 89749b9518..6db3501483 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/FieldToFieldMappingConverter.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Mapping/FieldToFieldMappingConverter.php
@@ -27,6 +27,9 @@ class FieldToFieldMappingConverter
                     $ret->disableIndexing();
                 }
                 else {
+                    $ret->addChild(
+                        (new StringFieldMapping('raw'))
+                            ->enableRawIndexing());
                     $ret->addChild(
                         (new StringFieldMapping('light'))
                             ->setAnalyzer('general_light')
@@ -55,6 +58,9 @@ class FieldToFieldMappingConverter
                     $ret->disableIndexing();
                 }
                 else {
+                    $ret->addChild(
+                        (new StringFieldMapping('raw'))
+                            ->enableRawIndexing());
                     $ret->addChild(
                         (new StringFieldMapping('light'))
                             ->setAnalyzer('general_light')