docs: public <A> A getAccumulator(ExecutionEnvironment env, String accumulatorName) {
  		JobExecutionResult result = env.getLastJobExecutionResult();
  
  		Preconditions.checkNotNull(result, "No result found for job, was execute() called before getting the result?");
  
  		return result.getAccumulatorResult(id + SEPARATOR + accumulatorName);
  	}