Backport of scaling: set Index on nil-job scale status reply into release/1.5.x #18647
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Backport
This PR is auto-generated from #18637 to be assessed for backporting due to the inclusion of the label backport/1.5.x.
The below text is copied from the body of the original PR.
I noticed this while working on hashicorp/nomad-autoscaler#604 -- When a job went away, the blocking query on
/v1/job/{job-id}/scalekept blocking for the full 5 minute timeout, instead of returning "not found" as soon as the job was purged/gc'd.returning a nil error in a
blockingOptions.run()without increasing the reply
Indexcan cause thequery to block indefinitely (until timeout).
this fixes that happening in
Job.ScaleStatuswhen the job is deleted -- the job going away
should now return as not-found and provide a new
index for the caller to try if they so please.
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