I have enabled the JIRA Tollkit Plugin and performed a re-index
But when I go to the SEARCH page and try to use the participants field, is not available
What I am trying to find is issues that were commented by a specific user.
Same as any other custom field. Admin -> Issues -> Fields, click "add field", look for "participants" as the field type, call it something sane, and when it asks what projects and/or issue types to limit it to, make sure it says "global context". Click add, stick it on any screens you want to display it on (not necessary if all you need is the ability to search it, but some people like having it on screen) and re-index.
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