Magento 2 : How to add customer child menu and reindex only customer grid programmatically?

If you want customer grid reindex programmatically, you can use the below step.

1. Create file menu.xml on app/code/Magemonkeys/CustomerReindex/etc/adminhtml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Backend:etc/menu.xsd">
    <menu>
        <add id="Magemonkeys_CustomerReindex::customer_reindex" title="Eagle Rocket" translate="title" module="Magemonkeys_CustomerReindex"
             sortOrder="50" resource="Magemonkeys_CustomerReindex::manage_customer_reindex" parent="Magento_Customer::customer"/>
        <add id="Magemonkeys_CustomerReindex::customer_manage" title="Customer Reindex" translate="title" module="Magemonkeys_CustomerReindex"
             sortOrder="10" parent="Magemonkeys_CustomerReindex::customer_reindex" action="customerreindex/customerindexer/index" resource="Magemonkeys_CustomerReindex::manage_customer_reindex"/>      
    </menu>
</config>

<?xml version="1.0"?>

<menu>

<add id="Magemonkeys_CustomerReindex::customer_reindex" title="Eagle Rocket" translate="title" module="Magemonkeys_CustomerReindex"

sortOrder="50" resource="Magemonkeys_CustomerReindex::manage_customer_reindex" parent="Magento_Customer::customer"/>

<add id="Magemonkeys_CustomerReindex::customer_manage" title="Customer Reindex" translate="title" module="Magemonkeys_CustomerReindex"

sortOrder="10" parent="Magemonkeys_CustomerReindex::customer_reindex" action="customerreindex/customerindexer/index" resource="Magemonkeys_CustomerReindex::manage_customer_reindex"/>

</menu>

</config>

2. Create file routes.xml on app/code/Magemonkeys/CustomerReindex/etc/adminhtml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
    <router id="admin">
        <route id="customerreindex" frontName="customerreindex">
            <module name="Magemonkeys_CustomerReindex" before="Magento_Backend" />
        </route>
    </router>
</config>

<?xml version="1.0"?>

</route>

</router>

</config>

3. Create file Index.php on app/code/Magemonkeys/CustomerReindex/Controller/Adminhtml/Customerindexer

<?php
namespace Magemonkeys\CustomerReindex\Controller\Adminhtml\Customerindexer;
class Index extends \Magento\Backend\App\Action
{
    protected $indexFactory;
    protected $indexCollection;
    protected $resultRedirectFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Indexer\Model\IndexerFactory $indexFactory,
        \Magento\Indexer\Model\Indexer\CollectionFactory $indexCollection,
        \Magento\Framework\Controller\Result\RedirectFactory $resultRedirectFactory,
        \Magento\Framework\Message\ManagerInterface $messageManager 
    )
    {
        parent::__construct($context);
        $this->indexFactory = $indexFactory;
        $this->indexCollection = $indexCollection;
        $this->resultRedirectFactory = $resultRedirectFactory;
        $this->_messageManager = $messageManager;
    }

    public function execute()
    {
        $indexerCollection = $this->indexCollection->create();
        $indexids = $indexerCollection->getAllIds();

        $indexid = 'customer_grid';
        $indexidarray = $this->indexFactory->create()->load($indexid);
        $indexidarray->reindexAll($indexid);

        $resultPage = $this->resultRedirectFactory->create();        
        $resultPage->setPath('customer/index/index');
        $this->_messageManager->addSuccess(__("Customer Reindex Successfully."));
        return $resultPage;            
    }    
}

<?php

namespace Magemonkeys\CustomerReindex\Controller\Adminhtml\Customerindexer;

class Index extends \Magento\Backend\App\Action

{

protected $indexFactory;

protected $indexCollection;

protected $resultRedirectFactory;

public function __construct(

\Magento\Backend\App\Action\Context $context,

\Magento\Indexer\Model\IndexerFactory $indexFactory,

\Magento\Indexer\Model\Indexer\CollectionFactory $indexCollection,

\Magento\Framework\Controller\Result\RedirectFactory $resultRedirectFactory,

\Magento\Framework\Message\ManagerInterface $messageManager

)

{

parent::__construct($context);

$this->indexFactory = $indexFactory;

$this->indexCollection = $indexCollection;

$this->resultRedirectFactory = $resultRedirectFactory;

$this->_messageManager = $messageManager;

}

public function execute()

{

$indexerCollection = $this->indexCollection->create();

$indexids = $indexerCollection->getAllIds();

$indexid = 'customer_grid';

$indexidarray = $this->indexFactory->create()->load($indexid);

$indexidarray->reindexAll($indexid);

$resultPage = $this->resultRedirectFactory->create();

$resultPage->setPath('customer/index/index');

$this->_messageManager->addSuccess(__("Customer Reindex Successfully."));

return $resultPage;

}

4. Output

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