fix sorting by metadatas on using elasticsearch

src/classes/class-tainacan-elastic-press.php

@@ -265,6 +265,15 @@ class Elastic_Press {
 				$formatted_args = $this->prepare_request_for_facet($formatted_args);
 				break;
 		}
+		if( isset($formatted_args['sort']) ) {
+			$new_sort = [];
+			foreach ($formatted_args['sort'] as $sort) {
+				foreach ($sort as $key => $value) {
+					$new_sort["$key.raw"] = $value;
+				}
+			}
+			$formatted_args['sort'] = $new_sort;
+		}
 		return $formatted_args;
 	}