AggregateCount.php

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<?php
namespace Magento\Catalog\Model\ResourceModel\Category;

use Magento\Catalog\Model\Category;

class AggregateCount
{
    public function processDelete(Category $category)
    {
        $resourceModel = $category->getResource();
        $parentIds = $category->getParentIds();
        if ($parentIds) {
            $childDecrease = $category->getChildrenCount() + 1;
            // +1 is itself
            $data = ['children_count' => new \Zend_Db_Expr('children_count - ' . $childDecrease)];
            $where = ['entity_id IN(?)' => $parentIds];
            $resourceModel->getConnection()->update($resourceModel->getEntityTable(), $data, $where);
        }
    }
}