[Release] Update docs for the 8.6.0 release (#33155)

* docs: update docs

* Bump heartbeat container version for k8s.

* Run make fmt.

Co-authored-by: elasticmachine <infra-root+elasticmachine@elastic.co>
Co-authored-by: Craig MacKenzie <craig.mackenzie@elastic.co>

deploy/kubernetes/auditbeat-kubernetes.yaml

@@ -109,7 +109,7 @@ spec:
       dnsPolicy: ClusterFirstWithHostNet
       containers:
       - name: auditbeat
-        image: docker.elastic.co/beats/auditbeat:8.4.0
+        image: docker.elastic.co/beats/auditbeat:8.6.0
         args: [
           "-c", "/etc/auditbeat.yml",
           "-e",

deploy/kubernetes/filebeat-kubernetes.yaml

@@ -64,7 +64,7 @@ spec:
       dnsPolicy: ClusterFirstWithHostNet
       containers:
       - name: filebeat
-        image: docker.elastic.co/beats/filebeat:8.4.0
+        image: docker.elastic.co/beats/filebeat:8.6.0
         args: [
           "-c", "/etc/filebeat.yml",
           "-e",

deploy/kubernetes/heartbeat-kubernetes.yaml

@@ -74,7 +74,7 @@ spec:
       dnsPolicy: ClusterFirstWithHostNet
       containers:
       - name: heartbeat
-        image: docker.elastic.co/beats/heartbeat:8.4.0
+        image: docker.elastic.co/beats/heartbeat:8.6.0
         args: [
           "-c", "/etc/heartbeat.yml",
           "-e",

deploy/kubernetes/metricbeat-kubernetes.yaml

@@ -159,7 +159,7 @@ spec:
       dnsPolicy: ClusterFirstWithHostNet
       containers:
       - name: metricbeat
-        image: docker.elastic.co/beats/metricbeat:8.4.0
+        image: docker.elastic.co/beats/metricbeat:8.6.0
         args: [
           "-c", "/etc/metricbeat.yml",
           "-e",

libbeat/docs/version.asciidoc

@@ -1,4 +1,4 @@
-:stack-version: 8.4.0
+:stack-version: 8.6.0
 :doc-branch: main
 :go-version: 1.18.6
 :release-state: unreleased