Merge pull request #1515 from rbayet/fix_1514_thesaurus_multi_words_a…

…ccents_support

Fixes #1514 Accents support in multi-words synonyms/expansions

src/module-elasticsuite-thesaurus/Model/Indexer/IndexHandler.php

@@ -161,7 +161,7 @@ private function addAnalyzerSettings($settings, $type, $values)
     private function prepareSynonymFilterData($rows)
     {
         $rowMaper = function ($row) {
-            return preg_replace('/([\w])[\s-](?=[\w])/', '\1_', $row);
+            return preg_replace('/([\w])[\s-](?=[\w])/u', '\1_', $row);
         };
 
         return array_map($rowMaper, $rows);