public int countTopLevelJobExecutions() {
		return this.xdJdbcSearchableJobExecutionDao.countTopLevelJobExecutions();
	}
Get a list of all {@link JobExecution}s that do not have any parent {@link JobExecution}s.

@param start
@param count

@return {@link List} of {@link JobExecution}s. Will never return null.
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/plugins/job/DistributedJobService.java