I have moved my ELK stack from 7.x to 8.x
i have exported dashboards from 7.x but while uploading to 8.x it gives error. Not supported.
As format is changed from .json to .ndjson.
NDJSON format for saved objects was introduced in 7.3
I've just tested to export from 7.3 a very simple dashboard and I could import it in 8.2 without issues so I think you need to upgrade your old cluster to 7.3 and try again.
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