Visualizations missing when export from old kibana system to new kibana system

Elastic Stack Kibana
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I exported the dashboard and visualizations from old kibana system (version 6.3). And then I imported them to the new Kibana (version 7.6).

However, only a few of them are successfully imported. And many of them are missing.

Actually when I was importing the json file of the visualizations, I saw msg as below:
Support for JSON files is going away Use our updated export to generate NDJSON files, and you'll be all set.

What is NDJSON? My old kibana does not have it. I can only export those visualizations as JSON files.

Is it the reason that my old visualizations are missing in the new kibana system?

2

What is NDJSON?

NDJSON stands for "newline delimented JSON". This is a file format where each JSON object is stored on a newline. JSON stands for "JavaScript Object Notation".

Have you followed the upgrade steps from Upgrade Kibana | Kibana Guide [8.11] | Elastic?
It is recommended that you upgrade to 6.8 first and then upgrade to 7.6.

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