The Agile views appear to use Sprint, and the online help just says that Iteration is a synonym for Sprint. However, when I search issues, I see both a Sprint column, and an Iteration one. If you use Iteration for your query, no records are returned, since that one is blank. Why is it there at all?
I looked under custom fields, and found that "Iteration" apparently shows up for everyone, just in case they choose to use the Tempo Planner. It's locked, so you can't remove it.
Iteration on list of locked fields.png
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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