Update output-elasticsearch.asciidoc (#1457)

* Update output-elasticsearch.asciidoc

* Update docs/en/ingest-management/elastic-agent/configuration/outputs/output-elasticsearch.asciidoc

---------

Co-authored-by: David Kilfoyle <[email protected]>
(cherry picked from commit 7fca79c)

Author: 2 people

docs/en/ingest-management/elastic-agent/configuration/outputs/output-elasticsearch.asciidoc

@@ -102,6 +102,8 @@ outputs:
 <1> In this example, the {es} nodes are available at
 `https://10.45.3.2:9220/elasticsearch` and
 `https://10.45.3.1:9230/elasticsearch`.
+
+Note that Elasticsearch Nodes in the link:{serverless-docs}[{serverless-full}] environment are exposed on port 443.
 // end::hosts-setting[]
 
 // =============================================================================