UpgradeData.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Swatches\Setup;

use Magento\Framework\Setup\UpgradeDataInterface;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Catalog\Model\Product;

/**
 * Upgrade Data script
 * @codeCoverageIgnore
 */
class UpgradeData implements UpgradeDataInterface
{
    /**
     * EAV setup factory
     *
     * @var EavSetupFactory
     */
    private $eavSetupFactory;

    /**
     * Init
     *
     * @param EavSetupFactory $eavSetupFactory
     */
    public function __construct(EavSetupFactory $eavSetupFactory)
    {
        $this->eavSetupFactory = $eavSetupFactory;
    }

    /**
     * {@inheritdoc}
     */
    public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();

        if (version_compare($context->getVersion(), '2.0.1', '<')) {
            /** @var \Magento\Eav\Setup\EavSetup $eavSetup */
            $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
            $groupId = (int)$eavSetup->getAttributeGroupByCode(
                Product::ENTITY,
                'Default',
                'image-management',
                'attribute_group_id'
            );
            $eavSetup->addAttributeToGroup(Product::ENTITY, 'Default', $groupId, 'swatch_image');
        }

        $setup->endSetup();
    }
}