We just upgraded from JIRA 3.15 to JIRA 6. We had a lof of custom fields, a few of them are user-picker type, such as DOC_owner, Manual_owner. In JIRA 3.15, we can select DOC_owner by picking a JIRA user (say john). However, after upgrade, the search always returns nothing, even we can see many issues have DOC_owner=john.
Do we need to do anything after upgrade?