Link ES section to KB article (#486)

* Link ES section to KB article

* Update doc-Service-Telemetry-Framework/modules/con_primary-parameters-of-the-servicetelemetry-object.adoc

---------

Co-authored-by: Leif Madsen <[email protected]>

doc-Service-Telemetry-Framework/modules/con_primary-parameters-of-the-servicetelemetry-object.adoc

@@ -111,6 +111,11 @@ spec:
 [NOTE]
 ====
 Older versions of {ProjectShort} would manage Elasticsearch objects for the community supported Elastic Cloud on Kubernetes Operator (ECK). Elasticsearch management functionality is deprecated as of {ProjectShort} 1.5.3. Future versions of Service Telemetry Operator will continue to support forwarding to an existing Elasticsearch instance (which can be deployed and managed by ECK), but will not manage the creation of Elasticsearch objects. When upgrading an {ProjectShort} deployment, any existing Elasticsearch object and deployment will remain intact, but will no longer be managed by {ProjectShort}.
+
+ifeval::["{build}" == "downstream"]
+Refer to this article for additional information about https://access.redhat.com/articles/7031236[Using Service Telemetry Framework with Elasticsearch]
+endif::[]
+
 ====
 
 To enable events forwarding to Elasticsearch as a storage back end, you must configure the `ServiceTelemetry` object.