I am trying to migrate Jira tickets over from a v7.1.0 board to a v8.5.4.
I understand this can be done by exporting all fields to excel, saving out as csv, importing via csv to the new system and mapping out the relevant fields.
A couple of the main requirements I have for this are to keep the epics and issues linked, and migrate comments over. Having spoken to someone who has carried out a similar migration previously they said they used the columns 'Issue ID', 'Parent ID' and 'Comment' to map the above. When I export I don't see any of these values. I'm not sure if this is just due to the old version of Jira I am exporting from or if there is something I am missing when doing the export.
Would appreciate any help with this. Thanks.