Hello Anuj,
Welcome to Atlassian community.
You can extend your JRJC Script it with a method that wraps JIRA REST API Call:
- Set the 'Epic Link' via REST call
Or you can use implementation from Atlassian: https://marketplace.atlassian.com/plugins/com.atlassian.jira.jira-rest-java-client
The code snippet for REST Java Client for JIRA:
issueRestClient.linkIssue(linkIssueInput);
Let me know if one of the options above helps you, Anuj.
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