To enable Checklist Searcher, ensure that you have administrator rights in JIRA and that you can access the administrative menus.
While creating a new Checklist custom field, the Checklist Searcher is setup as the default Search Template. However, if you have installed a previous version of Checklist, it is possible that the custom field has no associated search template. If so, to make the Checklist searchable, edit the checklist custom field and change the Search Template option to Checklist Searcher.
It is very important to re-index JIRA if you want previously created Checklists to be searchable.
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