You can find an answer to your question in the following article:
The idea is:
To Set epic link you have to use the same api as to set any other custom field value to an issue. First you get reference to the Epic link field. Secondly you set it using MutableIssue or IssueService like in the example above.
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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