[docker] Default server.name to hostname (#90799)

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

docs/setup/docker.asciidoc

@@ -120,7 +120,6 @@ The following settings have different default values when using the Docker
 images:
 
 [horizontal]
-`server.name`:: `kibana`
 `server.host`:: `"0.0.0.0"`
 `elasticsearch.hosts`:: `http://elasticsearch:9200`
 `monitoring.ui.container.elasticsearch.enabled`:: `true`

src/dev/build/tasks/os_packages/docker_generator/templates/kibana_yml.template.ts

@@ -17,7 +17,6 @@ function generator({ imageFlavor }: TemplateContext) {
   #
 
   # Default Kibana configuration for docker target
-  server.name: kibana
   server.host: "0.0.0.0"
   elasticsearch.hosts: [ "http://elasticsearch:9200" ]
   ${!imageFlavor ? 'monitoring.ui.container.elasticsearch.enabled: true' : ''}