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Your simplest and most straightforward upgrade path would be to port the CSV file to a common.yaml file and then switch to using lookup() with hieradata.
If you really must keep the CSV format, you can write your own function
that you use with hiera 5. It is quite simple. I show examples and
explain how hiera 5 works in this video:
https://www.slideshare.net/PuppetLabs/puppetconf-2017-hiera-5-the-full-data-enchilada-hendrik-lindberg-puppet
You may want to watch that even if you convert your data to yaml.