Never mind, stupid question. As I imagined it is obviously all a mapping problem. So it was sufficient to force the mapping on the landing index in the first place.
A new index (with a new template) plus a reindex forth and back fixed everything 
Never mind, stupid question. As I imagined it is obviously all a mapping problem. So it was sufficient to force the mapping on the landing index in the first place.
A new index (with a new template) plus a reindex forth and back fixed everything
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