Search & Replace via Rest API for JIRA
This script performs search and replace across a set of issues in JIRA via JIRA's REST API. The jira_search_replace.ini file contains the URL of the JIRA instance, the JQL to specify the set of issues, issue fields to modify, and the search and replace strings.
There is a second .ini file, auth.ini, which you will need to edit to supply the username and password which will be used to execute the REST calls.