Setup.php

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<?php
namespace Magento\Setup\Module;

use Magento\Framework\Setup\SchemaSetupInterface;
use Magento\Framework\App\ResourceConnection;

class Setup extends \Magento\Framework\Module\Setup implements SchemaSetupInterface
{
    public function getIdxName(
        $tableName,
        $fields,
        $indexType = '',
        $connectionName = ResourceConnection::DEFAULT_CONNECTION
    ) {
        return $this->getConnection($connectionName)->getIndexName($this->getTable($tableName), $fields, $indexType);
    }

    public function getFkName(
        $priTableName,
        $priColumnName,
        $refTableName,
        $refColumnName,
        $connectionName = ResourceConnection::DEFAULT_CONNECTION
    ) {
        return $this->getConnection($connectionName)->getForeignKeyName(
            $this->getTable($priTableName),
            $priColumnName,
            $refTableName,
            $refColumnName
        );
    }
}