oh ok. i see this KB
where they say
Each imported issue will be given a new JIRA ID, and the old Bugzilla ID will be saved into a JIRA custom field called 'External issue ID'. This custom field is searchable, so you can search for JIRA issues by their old Bugzilla ID.
you can use JQL to search in customfields.
we have a customfield for domains... if i want to search for ".com" entries i can search like this:
Domain ~ ".com"
it should be possible to use "External issue ID ~ YourID_here"
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