An anomaly detection job must be opened to be ready to receive and analyze
data. It can be opened and closed multiple times throughout its lifecycle.
When you open a new job, it starts with an empty model.
When you open an existing job, the most recent model state is automatically
loaded. The job is ready to resume its analysis from where it left off, once
new data is received.
The ID of the node that the job was started on. In serverless this will be the "serverless".
If the job is allowed to open lazily and has not yet been assigned to a node, this value is an empty string.