Index.php

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<?php
namespace Magento\Sales\Controller\Adminhtml\Invoice\AbstractInvoice;

abstract class Index extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Sales::sales_invoice';

    protected $resultPageFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory
    ) {
        parent::__construct($context);
        $this->resultPageFactory = $resultPageFactory;
    }

    protected function _initAction()
    {
        $resultPage = $this->resultPageFactory->create();
        $resultPage->setActiveMenu('Magento_Sales::sales_invoice')
            ->addBreadcrumb(__('Sales'), __('Sales'))
            ->addBreadcrumb(__('Invoices'), __('Invoices'));
        return $resultPage;
    }

    public function execute()
    {
        $resultPage = $this->_initAction();
        $resultPage->getConfig()->getTitle()->prepend(__('Invoices'));
        return $resultPage;
    }
}