IBX-8534: Fixed missing loadRelation method on ContentHandler (#79)

* IBX-8534: Fixed missing loadRelation method on ContentHandler

* Update src/lib/FieldMapper/ContentTranslationFieldMapper/ContentDocumentFulltextFields.php

Co-authored-by: Konrad Oboza <[email protected]>

---------

Co-authored-by: Konrad Oboza <[email protected]>

Author: ViniTou

src/lib/FieldMapper/ContentTranslationFieldMapper/ContentDocumentFulltextFields.php

@@ -175,7 +175,11 @@ private function doMapFields(Content $content, ContentType $contentType, $langua
      */
     private function doMapRelatedFields(Content $sourceContent, $languageCode, $maxDepth, $depth)
     {
-        $relations = $this->contentHandler->loadRelations($sourceContent->versionInfo->contentInfo->id);
+        $sourceContentId = $sourceContent->versionInfo->contentInfo->id;
+        $relations = $this->contentHandler->loadRelationList(
+            $sourceContentId,
+            $this->contentHandler->countRelations($sourceContentId)
+        );
 
         $relatedContents = $this->contentHandler->loadContentList(
             array_map(static function (Content\Relation $relation) {