[DOCS] Updates connecting with API Key

docs/connecting.asciidoc

@@ -55,6 +55,16 @@ image::docs/images/cloud_api_key.png["API key"]
 Once you have collected the `Cloud ID` and the `API key` you can use the client
 to connect to your Elastic Cloud instance, as follows:
 
+[source,ruby]
+------------------------------------
+client = Elasticsearch::Client.new(
+  cloud_id: '<CloudID>',
+  api_key: '<ApiKey>'
+)
+------------------------------------
+
+If you create the API Key through the dev console or the REST API, you may get instead a pair of `id` and `APIKey` values. The client also accepts a Hash for the `api_key` parameter, so you can pass in these values and it will encode the API Key internally:
+
 [source,ruby]
 ------------------------------------
 client = Elasticsearch::Client.new(