Can I change field name and type of the "Summary" Field which is system field in Jira?
Could you please let me know regarding this issue?
If you want to change only the name of the Summary field, you can create a customized translation for jira.
Changing its type, as far as I know, is not possible because is an internal field. But you can always define a new Custom Field with the name and type of your choice, and modify the Field configurations / screens related to your project to use it *instead* of the original Summary field ...
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