05-指定字段的变更次数

import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.issue.changehistory.ChangeHistory;
import com.atlassian.jira.issue.changehistory.ChangeHistoryManager;
import com.atlassian.jira.issue.history.ChangeItemBean;
 
import java.util.List;
 
ChangeHistoryManager changeHistoryManager = ComponentAccessor.getChangeHistoryManager();
List<ChangeItemBean> changeHistoryList = changeHistoryManager.getChangeItemsForField(issue,"duedate");
changeHistoryList.size();