Specifies the way data needs to be retrieved from the external target.
This information will be filled in by Iris and Magneto will pass it along
to the Icebox as it is to support bulk retrieval from Glacier.
Specifies the type of Restore Task.
'kStandard' specifies retrievals that allow to access any of your archives
within several hours. Standard retrievals typically complete within 3–5
hours. This is the default option for retrieval requests that do not specify
the retrieval option.
'kBulk' specifies retrievals that are Glacier’s lowest-cost retrieval
option, which can be used to retrieve large amounts, even petabytes, of data
inexpensively in a day. Bulk retrieval typically complete within 5–12 hours.
'kExpedited' specifies retrievals that allows to quickly access your data
when occasional urgent requests for a subset of archives are required. For
all but the largest archives (250 MB+), data accessed using Expedited
retrievals are typically made available within 1–5 minutes.
