The Mass Delete for Jira add-on makes removal of large number of Jira issues easy.
Unlike the bulk delete functionality provided by Jira, this add-on has no limit on the number of issues removed by one job. It simply removes all of the issues matching provided query. Depending on the number of issues the process may take substantial amount of time. Mass Delete for Jira provides real-time progress monitor, which can also be used to terminate a running job if necessary.