code: public ManagementVertex getOutputVertex(final int stage, final int index) {
  
  		if (stage >= this.stages.size()) {
  			return null;
  		}
  
  		return this.stages.get(stage).getOutputManagementVertex(index);
  	}
docs: Returns the output vertex with the specified index for the given stage.
  
  @param stage
  the index of the stage
  @param index
  the index of the output vertex to return
  @return the output vertex with the specified index or <code>null</code> if no output vertex with such an index
  exists in that stage