diff --git a/src/Query.php b/src/Query.php
index d17a5cd..2474830 100755
--- a/src/Query.php
+++ b/src/Query.php
@@ -22,6 +22,7 @@
 use Matchory\Elasticsearch\Interfaces\ConnectionInterface;
 use function count;
 use function json_encode;
+use function rtrim;
 use const JSON_THROW_ON_ERROR;
 
 /**
@@ -203,6 +204,18 @@ public function __construct(
         $this->model = $model ?? new Model();
     }
 
+    /**
+     * Adds a ".keyword" suffix to the given field name. This is useful for
+     * sorting and aggregating on keyword fields.
+     *
+     * @param string $field
+     * @return string
+     */
+    public static function asKeyword(string $field): string
+    {
+        return rtrim($field, '.') . '.keyword';
+    }
+
     /**
      * Retrieves the underlying Elasticsearch connection.
      *