Activate the highlighting feature

[christinach]

Related Prs where we activated the highlighting feature:
Highlight all the matching terms
Notes display
Subject fields
author display field
Activate highlight component

Explicitly adding the fields in the schema breaks the indexing if the specific fields are already indexed as dynamic fields.
We need to identify a way to configure this in a way that doesn't break the indexing. If any of the highlighting features in Orangelight are turned on with the current solr configuration in production the application will break.

• Investigate what is the best way to add these highlighting feature
• Do we need a separate solr config?
• Or do we need a separate request handler?