I want to migrate groups of issues (5-500 issues at a time) from one jira instance to another jira instance without migrating the whole project since the two instances have different structures.
Besides the usual fields i need the following information: comments in the actual sequence, change history, attachments, related to links, mentioned in links (starting from confluence).
And I need to adjust some of the fields before importing to the new instance (e.g. Status, assignee, add a comment).
How can I perform this migration?