Check if this will help you https://confluence.atlassian.com/jirakb/how-to-import-issue-links-from-a-csv-file-740262715.html
Many thanks, it was much more easy, the current importer has a mapping assistant
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In Epic Link field you need to insert or Epic Name or Epic key. It works.
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The importere shows only Epic name, but importing the key in it will not work (no error but also no effect)..
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Ok, it looks that the documentation is outdated, there is an assistent to map fields.
Very good, but
... how to fill the "Epic Link" field. This is not supported, only standard links.
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