code: public void unregisterTaskDef(String taskType) {
          Preconditions.checkArgument(StringUtils.isNotBlank(taskType), "Task type cannot be blank");
          delete("metadata/taskdefs/{tasktype}", taskType);
      }
docs: Removes the task definition of a task type from the conductor server.
  Use with caution.
  
  @param taskType Task type to be unregistered.