final List<String> langList = new ArrayList<>(item1.getLanguages().length + item2.getLanguages().length);
        Collections.addAll(langList, item1.getLanguages());
        for (final String lang : item2.getLanguages()) {
            if (!langList.contains(lang)) {
                langList.add(lang);
            }
        }
        mergedItem.languages = langList.toArray(new String[langList.size()]);

            newDoc.put(indexFieldDocId, systemHelper.generateDocId(newDoc));
            if (newDoc.get(indexFieldLang) instanceof final List<?> langList) {
                if (langList.contains("auto")) {
                    newDoc.remove(indexFieldLang);
                }
                languageHelper.updateDocument(newDoc);
            }
            return newDoc;