adding child properties to the parent node via java code

i need to add email address from all child nodes that are having, to the parent node but I'm unable to replicate my changes . my changes are not reflcting in the aem node . this is the code I'm using . ive installed the folder node from the package manager.

package com.cni.cq.dam.ui.contactsheet.service;

import org.apache.sling.api.resource.LoginException;

import org.apache.sling.api.resource.ResourceResolver;

import org.apache.sling.api.resource.ResourceResolverFactory;

import org.apache.sling.jcr.api.SlingRepository;

import org.osgi.service.component.annotations.Component;

import org.osgi.service.component.annotations.Reference;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.cni.cq.dam.core.assetbinary.AssetBinaryService;

import com.cni.cq.dam.core.publications.PublicationsService;

import java.util.HashMap;

import java.util.Map;

import javax.jcr.Node;

import javax.jcr.NodeIterator;

import javax.jcr.RepositoryException;

import javax.jcr.Session;

import javax.jcr.Value;

import javax.jcr.ValueFactory;

@8220494(immediate = true, service = UpdateEmailsService.class)

public class UpdateEmailsService {

    private static final Logger log = LoggerFactory.getLogger(UpdateEmailsService.class);

    @3214626

   ResourceResolverFactory resolverFactory;

     @3214626

    private XMLHandler xmlHandler;

    @3214626

    PublicationsService publicationService;

    @3214626

    AssetBinaryService assetBinaryService;

    @3214626

    SlingRepository slingRepository;

static String serviceUser = "shivakumar";

    public static ResourceResolver newResolver(ResourceResolverFactory resourceResolverFactory) throws LoginException {

    final Map<String, Object> paramMap = new HashMap<>();

    paramMap.put(ResourceResolverFactory.SUBSERVICE, serviceUser);

    // fetches the admin service resolver using service user.

    ResourceResolver resolver = resourceResolverFactory.getServiceResourceResolver(paramMap);

    return resolver;

}

    public void updateEmails() throws LoginException {

        ResourceResolver resolver = null;

        try {

            // Assuming you have a service user with sufficient privileges

            resolver=newResolver(resolverFactory);

            log.debug("Obtained Resource Resolver");

            Session session = resolver.adaptTo(Session.class);

            // Parent node path

            String parentNodePath = "/content/contracted-creator/g/ethan_james_green";

            Node parentNode = session.getNode(parentNodePath);

            log.debug("Got parent node: {}", parentNodePath);

            // Create or retrieve the "emails" property in the parent node

            ValueFactory valueFactory = session.getValueFactory();

            Value[] existingEmailsValue = parentNode.hasProperty("emailId")

                    ? parentNode.getProperty("emailId").getValues()

                    : new Value[0];

            log.debug("Existing emails count: {}", existingEmailsValue.length);

            // Create an array to store the updated email values

            Value[] updatedEmailsValue = new Value[existingEmailsValue.length];

            // Iterate through child nodes

            NodeIterator childNodes = parentNode.getNodes();

            int i = 0;

            while (childNodes.hasNext()) {

                Node childNode = childNodes.nextNode();

                if (childNode.hasProperty("emailId")) {

                    Value emailValue = childNode.getProperty("emailId").getValue();

                    // Add the email value to the array

                    updatedEmailsValue[i++] = emailValue;

                }

            }

            // Update the "emails" property in the parent node

            parentNode.setProperty("emailId", updatedEmailsValue);

            // Save changes

            session.save();

        } catch (RepositoryException e) {

            log.error("Error updating emailId", e);

        } finally {

            if (resolver != null && resolver.isLive()) {

                resolver.close();

            }

        }

    }

}