[Docs] Fix broken link to RTD helpers page (#2958)

* Fix broken link to RTD helpers page

* Update index.md

* remove circular redirect

Author: marciw

docs/reference/client-helpers.md

@@ -5,7 +5,7 @@ mapped_pages:
 
 # Client helpers [client-helpers]
 
-You can find here a collection of simple helper functions that abstract some specifics of the raw API. For detailed examples, refer to [this page](https://elasticsearch-py.readthedocs.io/en/stable/helpers.html).
+You can find here a collection of simple helper functions that abstract some specifics of the raw API.
 
 
 ## Bulk helpers [bulk-helpers]

docs/reference/index.md

@@ -46,7 +46,7 @@ The client’s features include:
 * Thread safety
 * Pluggable architecture
 
-The client also contains a convenient set of [helpers](https://elasticsearch-py.readthedocs.org/en/master/helpers.md) for some of the more engaging tasks like bulk indexing and reindexing.
+The client also contains a convenient set of [helpers](client-helpers.md) for some of the more engaging tasks like bulk indexing and reindexing.
 
 
 ## Elasticsearch Python DSL [_elasticsearch_python_dsl]