docs: public StreamExecutionEnvironment setMaxParallelism(int maxParallelism) {
  		Preconditions.checkArgument(maxParallelism > 0 &&
  						maxParallelism <= KeyGroupRangeAssignment.UPPER_BOUND_MAX_PARALLELISM,
  				"maxParallelism is out of bounds 0 < maxParallelism <= " +
  						KeyGroupRangeAssignment.UPPER_BOUND_MAX_PARALLELISM + ". Found: " + maxParallelism);
  
  		config.setMaxParallelism(maxParallelism);
  		return this;
  	}