How Can I get custom field from epic link?

[Alex]

How can I get a custom epik field with a link to it ?

import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.component.ComponentAccessor

def customFieldManager = ComponentAccessor.getCustomFieldManager()

def epicLinkCf = customFieldManager.getCustomFieldObjectByName("Epic Link")
def epicIssue = issue.getCustomFieldValue(epicLinkCf) as Issue
def epicCustomField = customFieldManager.getCustomFieldObjectByName("Rank")

def textCf2 = customFieldManager.getCustomFieldObjects(issue).find {it.name == "EpicRank"}
if (textCf2) {
def changeHolder = new DefaultIssueChangeHolder()
textCf2.updateValue(null, issue, new ModifiedValue(issue.getCustomFieldValue(textCf2), issue.getCustomFieldValue(epicLinkCf).toString()),changeHolder)
}