Fix count method

Author: Olek Kaim

src/Client.php

@@ -275,6 +275,10 @@ public function decrement(string $index, string|int $id, string $field, int $val
      */
     public function count(string $index, array $data = []): int
     {
+        if (isset($data['_source'])) {
+            unset($data['_source']);
+        }
+
         if (empty($data)) {
             $data = [
                 'query' => [