How to get issue key from LinkCreated Event from Script Listener

[kponnus1]

1. When any link is created using linkCreated event is it possible to get exact issue key from where the link is created?.

i can use below code to determine source and destination issue id

def linkId = issueLink.entrySet().getAt(0).value

def sourceIssueID =issueLink.entrySet().getAt(1).value

def destIssueID =issueLink.entrySet().getAt(2).value

However this source and destination id got changed when issue link type is changes from inward to outward when a link is created 

2.The get issue link API also doesn't support direction to finalize from which issue the link is created like below in jira expression.

Jira expressions types (atlassian.com)

See issueLink -> direction