Is there a way where we can only search parent issues and not sub-tasks in a project.
For example: If we have 1000 issues in a project out of which 100 are the parent issues and rest 900 are sub-tasks. SO is there a way to search only those 100 parent tasks in JIRA.
>as I have 'Bug' issue type as a parent issue and 'Bug' as a subtask as well
No, you don't. Probably. Issue names *must* be unique in Jira. I suspect you've probably got something like "Bug" and "Bug." or " Bug" (note the whitespace). If you have really got two issue types with the same name, then you've hacked something and you really do need to rename them to be unique or you'll run into problems.
The JQL will work, but I'm not sure exactly which version that function arrived in.
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