How to update a Jira Cloud parent issue field via REST API

Use Case
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This use case involves updating the parent field of a Jira issue during Exalate synchronization. Since Jira Cloud requires API-based updates for certain fields like parent , the script uses the Jira Cloud REST API to dynamically update the parent field.

The process retrieves the local parent issue using the replica.parentId , constructs a JSON payload with the parent issue key, and sends a PUT request to the Jira Cloud endpoint /rest/api/3/issue/{issueKey} . This ensures the child issue is correctly linked to its parent during synchronization.

Outgoing sync script (Source)

replica.parentId       = issue.parentId

Incoming sync script (Destination)

if (replica.parentId) {
   def localParent = nodeHelper.getLocalIssueFromRemoteId(replica.parentId.toLong())
 if (localParent) {

    def apiEndpoint = "/rest/api/3/issue/"+issueKey.id

    def requestBodyJson = """
        {
            "fields": {
                "parent": {
                    "key": "${localParent.key}"
                }
            }
        }
        """
        // Use the HTTP client to send the PUT request
        def response = httpClient.put(apiEndpoint, requestBodyJson)
   }
}