Update release notes and related files (#2717) (#2718)

Co-authored-by: Marci W <333176+marciw@users.noreply.github.com>

Author: JoshMock

docs/release-notes/deprecations.md

@@ -5,18 +5,13 @@ navigation_title: "Deprecations"
 # Elasticsearch JavaScript Client deprecations [elasticsearch-javascript-client-deprecations]
 Over time, certain Elastic functionality becomes outdated and is replaced or removed. To help with the transition, Elastic deprecates functionality for a period before removal, giving you time to update your applications.
 
-Review the deprecated functionality for Elasticsearch JavaScript Client. While deprecations have no immediate impact, we strongly encourage you update your implementation after you upgrade. To learn how to upgrade, check out [Upgrade](docs-content://deploy-manage/upgrade.md).
+Review the deprecated functionality for the Elasticsearch JavaScript Client. While deprecations have no immediate impact, we strongly encourage you update your implementation after you upgrade. To learn how to upgrade, check out [Upgrade](docs-content://deploy-manage/upgrade.md).
 
-% ## Next version
+## 9.0.0 [elasticsearch-javascript-client-900-deprecations]
 
-% ::::{dropdown} Deprecation title
-% Description of the deprecation.
-% For more information, check [PR #](PR link).
-% **Impact**<br> Impact of deprecation. 
-% **Action**<br> Steps for mitigating deprecation impact.
-% ::::
+_No deprecations_
 
-% ## 9.0.0 [elasticsearch-javascript-client-900-deprecations]
+% ## Next version
 
 % ::::{dropdown} Deprecation title
 % Description of the deprecation.

docs/release-notes/index.md

@@ -1,5 +1,7 @@
 ---
-navigation_title: "Release notes"
+navigation_title: "Elasticsearch JavaScript Client"
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/changelog-client.html
 ---
 
 # Elasticsearch JavaScript Client release notes [elasticsearch-javascript-client-release-notes]
@@ -36,4 +38,4 @@ To check for security updates, go to [Security announcements for the Elastic sta
 
   Docstrings for types that differ between stack and serverless have also been updated to indicate when that is the case.
 
-### Fixes [elasticsearch-javascript-client-900-fixes]
+% ### Fixes [elasticsearch-javascript-client-900-fixes]

docs/release-notes/known-issues.md

@@ -5,6 +5,10 @@ navigation_title: "Known issues"
 
 # Elasticsearch JavaScript Client known issues [elasticsearch-javascript-client-known-issues]
 
+## 9.0.0 
+
+_No known issues_
+
 % Use the following template to add entries to this page.
 
 % :::{dropdown} Title of known issue
@@ -17,4 +21,4 @@ navigation_title: "Known issues"
 % **Resolved**
 % On [Month/Day/Year], this issue was resolved.
 
-:::
+% :::