Remove Specific Links from an Issue

import com.atlassian.jira.component.ComponentAccessor

final def issueKey = '<ISSUE_KEY>'

//Specify the Link Type ID
final def linkTypeId = 10000

def loggedInUser = ComponentAccessor.jiraAuthenticationContext.loggedInUser
def issueManager = ComponentAccessor.issueManager
def issueLinkManager = ComponentAccessor.issueLinkManager

def issue = issueManager.getIssueObject(issueKey)

issueLinkManager.getOutwardLinks(issue.id).each {
    if (it.linkTypeId == linkTypeId) {
        issueLinkManager.removeIssueLink(it, loggedInUser)
    }
}