SuggestCategories.php

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<?php
namespace Magento\Catalog\Controller\Adminhtml\Category;

class SuggestCategories extends \Magento\Catalog\Controller\Adminhtml\Category
{
    protected $resultJsonFactory;

    protected $layoutFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory,
        \Magento\Framework\View\LayoutFactory $layoutFactory
    ) {
        parent::__construct($context);
        $this->resultJsonFactory = $resultJsonFactory;
        $this->layoutFactory = $layoutFactory;
    }

    public function execute()
    {
        $resultJson = $this->resultJsonFactory->create();
        return $resultJson->setJsonData(
            $this->layoutFactory->create()->createBlock(\Magento\Catalog\Block\Adminhtml\Category\Tree::class)
                ->getSuggestedCategoriesJson($this->getRequest()->getParam('label_part'))
        );
    }
}