[Backport 8.13] Make helpers examples runnable (#2498)

Co-authored-by: Quentin Pradet <[email protected]>
(cherry picked from commit 8a97cc1)

Co-authored-by: Iulia Feroli <[email protected]>

Author: github-actions[bot]

docs/sphinx/helpers.rst

@@ -5,6 +5,15 @@ Helpers
 
 Collection of simple helper functions that abstract some specifics of the raw API.
 
+Connecting
+----------
+
+.. code-block:: python
+
+    from elasticsearch import Elasticsearch
+    
+    client = Elasticsearch("https://.../", api_key="YOUR_API_KEY")
+
 
 Bulk helpers
 ------------