import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.event.type.EventDispatchOption;

def issueManager = ComponentAccessor.getIssueManager();

//def currentIssue = Issues.getByKey("TEST2-2") as MutableIssue
def currentIssue = event.issue as MutableIssue

def components = currentIssue.getComponents()

//如果存在多个模块，这里只取第一个模块的lead
def componentLeader = components.getAt(0).componentLead
currentIssue.setAssignee(componentLeader)
issueManager.updateIssue(ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser(), currentIssue, EventDispatchOption.ISSUE_UPDATED, true);