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EmtApplyExecutor is the service that sends tasks to Machine Translation (MT) when a task reaches an MT Step in the workflow. This is done by checking the MT queue once every 60 seconds and processing any tasks it finds that are waiting to be translated.
The advantage of the EmtApplyExecutor not being a true System Workflow Step is that other tasks can be processed while waiting for the Machine translation to be returned. By treating MT the same as a human translator would be treated when a task reaches a traditional Translation step, the workflow queue will not have to wait for the process to be completed.