code: public boolean existsJobSchedule(String jobScheduleId, Iterable<BatchClientBehavior> additionalBehaviors) throws BatchErrorException, IOException {
          JobScheduleExistsOptions options = new JobScheduleExistsOptions();
          BehaviorManager bhMgr = new BehaviorManager(this.customBehaviors(), additionalBehaviors);
          bhMgr.applyRequestBehaviors(options);
  
          return this.parentBatchClient.protocolLayer().jobSchedules().exists(jobScheduleId, options);
      }
docs: Checks whether the specified job schedule exists.
  
  @param jobScheduleId The ID of the job schedule which you want to check.
  @param additionalBehaviors A collection of {@link BatchClientBehavior} instances that are applied to the Batch service request.
  @return True if the specified job schedule exists; otherwise, false.
  @throws BatchErrorException Exception thrown when an error response is received from the Batch service.
  @throws IOException Exception thrown when there is an error in serialization/deserialization of data sent to/received from the Batch service.