code: def execute_plan(self, plan, allow_rf_change=False):
          
          if self.should_execute():
              result = self.zk.execute_plan(plan, allow_rf_change=allow_rf_change)
              if not result:
                  self.log.error('Plan execution unsuccessful.')
                  sys.exit(1)
              else:
                  self.log.info(
                      'Plan sent to zookeeper for reassignment successfully.',
                  )
          else:
              self.log.info('Proposed plan won\'t be executed (--apply and confirmation needed).')
docs: Save proposed-plan and execute the same if requested.