How can I use the External System Import to update the Summary field?

[April_Delay]

I have an existing project in Jira with issues. Let's say it's ABC-1 thru ABC-10. I need to import a csv using the External System Import function. I need this CSV to capture any updates to ABC-1 thru 10, and create new issues for ABC-11 thru 20

MY ISSUE: If the 'Summary' field has changed on ABC-1-10 since the previous import, then the importer skips those issues. How do I manipulate my csv to have the importer update the 'Summary' field instead of skipping those issues?

This is my understanding of how the importer works:

1. Import wizard is using Issue Key and Summary to find and update deltas for existing issues. This creates 2 problems:
   1. We cannot update an issue Summary using a csv import
   2. Issues that have changed summary since last import no longer match what Jira is looking for, so those issues cannot be updates with csv import

Thus far I've tried to manipulate my csv to use the following columns

1.  Issue Type, Issue key, issue if, parent id, Summary, Summary → does not work, cannot use Summary, Summary, 2nd column must have different name
2.  Issue Type, Issue key, issue if, parent id, Summary, Summary 2 → does not work, skips existing issues
3. Issue key, issue id, Summary 2 → does not work, skips existing issues
4.  Issue Type, Issue key, issue if, parent id, Summary (empty column), Summary 2 → does not work, skips existing issues