The _ml/info response now includes two extra fields in its
`limits`:
1. `max_single_ml_node_processors`
2. `total_ml_processors`
These fields are _only_ included if they can be accurately
calculated. If autoscaling is enabled and the ML nodes are
not at their maximum size then these fields _cannot_
currently be accurately calculated. (This could potentially
be improved in the future with additional settings set by
the control plane.)
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