Operation last update time. If the operation
is done, this is also the finish time.
Count of entries that were processed
Count of entries that encountered errors
Deprecated. This field is never set.
Pub/Sub topic for receiving notification. If this field is
set, when the import is finished, a notification will be
sent to specified Pub/Sub topic. The message data will be
JSON string of a `Operation][google.longrunning.Operation]`.
Format of the Pub/Sub topic is