Steps to reproduce:
1. I am testing the migration from 2.1 to 2.2 (in fact even ferom 1.6 to 2.2 with any major version in between)
2. I have an Opencast 2.1 with 20 jobs inside. I used the DB migration script, I deleted the elastic search index, I rebuild the elastic search index, I deleted all SOLR search indices.
3. When restarting Opencast I see the error in the Code Snippet as a reason, why the Workflow Search index could not be activated.
Workaround (if any):