making an update API call to disable or enable a monitor is not the best practice and is also very cumbersome as user would need to be aware of mapping of monitor document.
Since monitors are jobs and require to be enabled or disabled we should provide one of the following:

1. PUT _plugins/_alerting/monitors/{monitor_id}/enable and PUT _plugins/_alerting/monitors/{monitor_id}/disable
2. PUT _plugins/_alerting/monitors/{monitor_id}}/status {"enable" = true/false}