I'm not entirely sure about that comment that if you added a field to your json doc via enrich processor that the field won't show up in the mapping. Either way if you don't see the object in your mapping, does it exist in _source? if so, you can create a runtime field in Kibana from source.
What is your current value for discover:searchFieldsFromSource on Advanced Settings page? And does JSON view include unqiue_db_tag.... values in fields section?
Also it could be that unqiue_db_tag.* were set to be excluded based on settings on Stack Management > Data view > Field filters page.
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