Add ability to enable/disable pipelines

In Logstash 6.0, we can add or remove pipelines.
It would be great to be able to disable a pipeline (without removing it and all its configuration), so that we can re-enable it later.
This is particularly useful for pipelines that we want to activate not always, but on demand for a limited time.
Obviously, this feature would be really great if it can be done using à rest API or something like that, so that it doesn't require a Logstash restart.