code: public boolean addEventExecution(EventExecution eventExecution) {
          boolean added = executionDAO.addEventExecution(eventExecution);
          if (added) {
              indexDAO.addEventExecution(eventExecution);
          }
          return added;
      }
docs: Save the {@link EventExecution} to the data store
  Saves to {@link ExecutionDAO} first, if this succeeds then saves to the {@link IndexDAO}.
  
  @param eventExecution the {@link EventExecution} to be saved
  @return true if save succeeds, false otherwise.