Bug 33316: Improve display of ES indexer jobs

Bug 33316: Improve display of ES indexer jobs

We don't do a lot of processing to the data, but we can still
make the display a bit nicer, to show how many records were
done, and show the record ids.

To test:
1 - Do some batch modifications on a system running ES
2 - Check background jobs to see ES jobs
3 - Note display
4 - Apply patch
5 - Confirm display is improved

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>