changeLog.internalDelegator [GenericEntity.get] "internalDelegator" is not a field of ChangeGroup

I am writing some scriptrunner listener code in Jira to be triggered when an issue of type impediment is updated and here is my code:

    import com.atlassian.event.Eventimport java.util.HashMap;import java.util.List;import org.apache.log4j.Logger;import org.ofbiz.core.entity.GenericValue;import org.ofbiz.core.entity.GenericEntity;import com.atlassian.jira.component.ComponentAccessor;import com.atlassian.jira.event.issue.AbstractIssueEventListener;import com.atlassian.jira.event.issue.IssueEvent;import com.atlassian.jira.issue.ModifiedValue;import com.atlassian.jira.issue.MutableIssue;import com.atlassian.jira.issue.fields.CustomField;import com.atlassian.jira.issue.util.DefaultIssueChangeHolder;import com.atlassian.jira.issue.util.IssueChangeHolder;import org.apache.log4j.Loggerimport com.atlassian.jira.issue.Issue;import com.atlassian.jira.component.ComponentAccessorimport java.util.HashMap;import java.util.List;import org.apache.log4j.Logger;import org.ofbiz.core.entity.GenericValue;def log = Logger.getLogger("atlassian-jira.log")log.warn("Start Auto Defaults Listener");log.warn("IssueMounaEvent = " + event); Issue issue = event.getIssue();log.warn("IssueMouna = " + issue);if (issue.getIssueType().getName().equalsIgnoreCase("Impediment")) {log.warn("Analyzing IMPEDIMENT changelog Mouna ...");event2= (IssueEvent) event; def warning = analyzeImpedimentChangeLog(event2);}def analyzeImpedimentChangeLog(IssueEvent event) {def warning = "";log.warn("IMPEDIMENT STATUS ")List<GenericValue> changeItems = null;def impedimentStatus = event.getIssue().getStatus().getName();log.warn("IMPEDIMENT STATUS "+impedimentStatus)if (!"New".equalsIgnoreCase(impedimentStatus) && !"Inspecting".equalsIgnoreCase(impedimentStatus)) {GenericValue changeLog = event.getChangeLog();log.warn("HERE 1")HashMap<String, Object> fields = new HashMap<String,Object>();log.warn("HERE 2")fields.put("group", changeLog.get("id"));log.warn("HERE 3")String author = changeLog.getString("author");log.warn("HERE 4")try{log.warn("CHANGE LOG: "+changeLog.internalDelegator)changeItems = changeLog.internalDelegator.findByAnd("ChangeItem", fields); log.warn("HERE 5")}catch(Exception e){log.warn("EXCEPTIONMOUNA "+e)}}return warning;} 

I receive the following error, which is kind of weird because this was previously implemented in Java and it worked fine:

2022-08-11 EXCEPTIONMOUNA java.lang.IllegalArgumentException: [GenericEntity.get] "internalDelegator" is not a field of ChangeGroup

I would like to execute the following line of code:

changeItems = changeLog.internalDelegator.findByAnd("ChangeItem", fields); 

and I receive the exception above when writing the following line of code into the log:

log.warn("CHANGE LOG: "+changeLog.internalDelegator)

This code was previously implemented as a Java plugin and it worked fine in this way. What needs to be done in this case in order to adapt this statement to groovy in ScriptRunner?