Hello there,
You can create a link between FishEye changeset and JIRA issue by including JIRA issue ID on your commit comment.
What can you do when you forgot to do this and later want to associate changeset with JIRA issue? We are using subversion, and modifying subverion commit comment to add the issue ID did not help.
If you have an idea, please let us know.
Regards,
Daisuke Niwa