Add 1.2.1 release notes and highlights (#3579) (#3581)

* Add 1.2.1 release notes and highlights

* Add include statements

Author: charith-elastic

docs/release-notes.asciidoc

@@ -6,6 +6,7 @@
 
 This section summarizes the changes in each release.
 
+* <<release-notes-1.2.1>>
 * <<release-notes-1.2.0>>
 * <<release-notes-1.1.2>>
 * <<release-notes-1.1.1>>
@@ -16,6 +17,7 @@ This section summarizes the changes in each release.
 
 --
 
+include::release-notes/1.2.1.asciidoc[]
 include::release-notes/1.2.0.asciidoc[]
 include::release-notes/1.1.2.asciidoc[]
 include::release-notes/1.1.1.asciidoc[]

docs/release-notes/1.2.1.asciidoc

@@ -0,0 +1,23 @@
+:issue: https://github.com/elastic/cloud-on-k8s/issues/
+:pull: https://github.com/elastic/cloud-on-k8s/pull/
+
+[[release-notes-1.2.1]]
+== {n} version 1.2.1
+
+
+
+
+[[enhancement-1.2.1]]
+[float]
+=== Enhancements
+
+* Add support for keystore with Kibana 7.9.0 {pull}3566[#3566] (issue: {issue}3528[#3528])
+
+[[bug-1.2.1]]
+[float]
+=== Bug fixes
+
+* Check if CA Secret is expected before validating its name {pull}3527[#3527] (issue: {issue}3523[#3523])
+* Fix memory corruption from pod template validation {pull}3524[#3524] (issue: {issue}3421[#3421])
+
+

docs/release-notes/highlights-1.2.1.asciidoc

@@ -0,0 +1,35 @@
+[[release-highlights-1.2.1]]
+== 1.2.1 release highlights
+
+This is a patch release to address some issues found after the 1.2.0 release. See <<release-highlights-1.2.0>> for the full highlights of the 1.2.x series.
+
+
+[float]
+[id="{p}-121-fixes"]
+=== Fixes
+
+[float]
+[id="{p}-121-fix-kibana-keystore"]
+==== Support for Kibana 7.9.0
+
+Support has been added for managing secure settings for Kibana 7.9.0 which expects the keystore to be located at a different path from previous versions.
+
+[float]
+[id="{p}-121-bug-kibana-ref"]
+==== APM Server and Beats not starting up when referenced Kibana has TLS disabled
+
+APM Server and Beats resources should no longer fail to start if the Kibana referenced using `kibanaRef` has TLS disabled.
+
+[float]
+[id="{p}-121-bug-memory-corruption"]
+==== Elasticsearch failing to start under certain conditions
+
+Having the Istio CNI plugin enabled or enabling `automountServiceAccountToken` in the pod template should no longer prevent the Elasticsearch containers from failing to start with the error message `/usr/local/bin/docker-entrypoint.sh: line 49: /usr/share/elasticsearch/bin/elasticsearch-env-from-file: No such file or directory`.
+
+
+[float]
+[id="{p}-121-known-issues"]
+=== Known issues
+
+- Elasticsearch link:https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html#transform-node[transform nodes] are not automatically labelled by the operator. If you need to identify transform nodes, use the `podTemplate` of the `nodeSet` to add your own label.
+- If you want to try out Workplace Search, use the <<{p}-licensing,ECK trial licensing>> mechanism instead of clicking on the _Start a Free Trial_ button on the Enterprise Search splash screen.

docs/release-notes/highlights.asciidoc

@@ -5,6 +5,7 @@
 --
 This section summarizes the most important changes in each release. For the full list, see <<eck-release-notes>>.
 
+* <<release-highlights-1.2.1>>
 * <<release-highlights-1.2.0>>
 * <<release-highlights-1.1.2>>
 * <<release-highlights-1.1.1>>
@@ -15,6 +16,7 @@ This section summarizes the most important changes in each release. For the full
 
 --
 
+include::highlights-1.2.1.asciidoc[]
 include::highlights-1.2.0.asciidoc[]
 include::highlights-1.1.2.asciidoc[]
 include::highlights-1.1.1.asciidoc[]