Add two journal articles with spanish translation.
In a portlet, try to sort with this code:
final Query query = TermQueryFactoryUtil.create(searchCtx, "entryClassName", "com.liferay.portlet.journal.model.JournalArticle" );
final Sort sort = SortFactoryUtil.getSort(JournalArticle.class, "title_es_ES", "asc");
final Hits hits = SearchEngineUtil.search(SearchEngineUtil.SYSTEM_ENGINE_ID, company.getCompanyId(), query, sort,
Problem: the field title_es_ES is tokenized, so it isn't possible to sort by this field. However, In 6.2.x, we added a copy of the title field not tokenized, that is used to sorting purposes.