Update settings
[Required authorization] Route required privileges: fleet-settings-all.
PUT /api/fleet/settings
curl \ --request PUT 'https://<KIBANA_URL>/api/fleet/settings' \ --header "Authorization: $API_KEY" \ --header "Content-Type: application/json" \ --header "kbn-xsrf: true" \ --data '{"additional_yaml_config":"string","delete_unenrolled_agents":{"enabled":true,"is_preconfigured":true},"has_seen_add_data_notice":true,"kibana_ca_sha256":"string","kibana_urls":["https://example.com"],"prerelease_integrations_enabled":true}'