Add serverless changelog

Author: lcawl

docs/en/install-upgrade/index.asciidoc

@@ -43,4 +43,6 @@ include::upgrading-kibana.asciidoc[]
 
 include::breaking.asciidoc[]
 
+include::serverless-changelog.asciidoc[]
+
 include::redirects.asciidoc[]

docs/en/install-upgrade/serverless-changelog.asciidoc

@@ -0,0 +1,15 @@
+[[serverless-changelog]]
+== Elastic Cloud Serverless changelog
+++++
+<titleabbrev>Serverless changelog</titleabbrev>
+++++
+
+Review the latest improvements and changes to Elastic Cloud Serverless.
+
+For serverless API changes, refer to https://www.elastic.co/docs/api/changes[APIs Changelog].
+
+For serverless changes in Cloud Console, refer to https://www.elastic.co/guide/en/cloud/current/ec-release-notes.html[Elasticsearch Service Documentation: Release notes].
+
+For December 2024 and January 2025 changes, refer to https://www.elastic.co/guide/en/serverless/current/serverless-changelog.html[Serverless changelog].
+
+coming::[February 2025]