Log, once per (template, entity, field), that a template explicitly references a field kept out
of shared indexes. The field renders empty: the value is withheld rather than the record
skipped, so the rest of the document still indexes.
Parameters
templateKey: string
identifies the template (its ID or name) in the warning and the once-only key
templateText: string
the template's source, scanned for the field names
Log, once per (template, entity, field), that a template explicitly references a field kept out of shared indexes. The field renders empty: the value is withheld rather than the record skipped, so the rest of the document still indexes.