code: public Observable<Boolean> existsAsync(String jobScheduleId) {
          return existsWithServiceResponseAsync(jobScheduleId).map(new Func1<ServiceResponseWithHeaders<Boolean, JobScheduleExistsHeaders>, Boolean>() {
              @Override
              public Boolean call(ServiceResponseWithHeaders<Boolean, JobScheduleExistsHeaders> response) {
                  return response.body();
              }
          });
      }
docs: Checks the specified job schedule exists.
  
  @param jobScheduleId The ID of the job schedule which you want to check.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Boolean object