Index metadata not retrieved on alias

### What went wrong?

When running `yarn django alias` creating the job failed. This was due to `update_index_metadata` not being executed, or failing silently. The alias command also does not provide an adequate error report.

### What did you expect to happen?

The index metadata should be retrieved before attempting an alias, or at least report on the problem.

### Screenshot

### Where did you find the bug?

- [ ] https://textcavator.hum.uu.nl
- [x] https://peopleandparliament.hum.uu.nl
- [ ] https://peace.sites.uu.nl
- [ ] a server hosted elsewhere (i.e. not by the research software lab)
- [ ] a local server

### Version

5.27.0

### Steps to reproduce

`yarn django alias` on the server