This change seems a little odd to me. To get the executions for a single job, you now do:

    http://localhost:8080/batch/executions/myJob

instead of 

    http://localhost:8080/batch/jobs/myJob/executions

The second one seems more intuitive to me from a rest standpoint, since we are looking for a collection of executions that is part of `myJob`.  I understand why you made this change, so that you can keep this endpoint in the `BatchExecutionsController`.  

But perhaps, this endpoint should be moved to `BatchJobsController`.