New Enhancements Script

[floriangantner]

Is your feature request related to a problem? Please describe.
The current metadata enhancer is really slow. It takes a lot of time and is error-prone, because the results are only commited once. Only all items can be enhanced at one time.

Describe the solution you'd like
We've written two scripts which commit after x commits. The set of items can be limited to some subset based on the collection, entity type or some solr-query.

Describe alternatives or workarounds you've considered

Additional context