4
Based on the comment by @4k4 and post at https://drupal.stackexchange.com/a/235942/70681 and further reading, I used my existing custom module (rsc) to solve the problem as follows:
In modules/custom/rsc/rsc.services.yml
services:
rsc.event.SolrException:
class: Drupal\rsc\EventSubscriber\rscSolrException
tags:
- { name: event_subscriber }
...
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