code: protected function execute(InputInterface $input, OutputInterface $output) // @codingStandardsIgnoreLine - required by parent class
      {
  
          $configPaths = [
              'geoip_country_mapping' => \Fastly\Cdn\Model\Config::XML_FASTLY_GEOIP_COUNTRY_MAPPING
          ];
  
          foreach ($configPaths as $path) {
              $magVer = $this->productMetadata->getVersion();
              if (version_compare($magVer, '2.2', '<')) {
                  $output->writeln(
                      'Warning : This function is used for converting serialized data to JSON'
                          . ' (recommended for Magento versions above 2.2)'
                  );
              }
  
              $oldData = $this->scopeConfig->getValue($path);
  
              try {
                  $oldData = unserialize($oldData); // @codingStandardsIgnoreLine - used for conversion of old Magento format to json_decode
              } catch (\Exception $e) {
                  $oldData = false;
              }
  
              if ($oldData === false) {
                  $output->writeln(
                      'Invalid serialization format, unable to unserialize config data : ' . $path
                  );
  
                  return;
              }
              $oldData = (is_array($oldData)) ? $oldData : [];
  
              $newData = json_encode($oldData);
              if (false === $newData) {
                  throw new \InvalidArgumentException('Unable to encode data.');
              }
  
              $this->configWriter->save($path, $newData); // @codingStandardsIgnoreLine - currently best way to resolve this
              $this->cacheManager->clean([\Magento\Framework\App\Cache\Type\Config::TYPE_IDENTIFIER]);
  
              $output->writeln('Config Cache Flushed');
          }
      }
docs: Converts Fastly serialized data to JSON format
  
  @param InputInterface $input
  @param OutputInterface $output
  @return int|null|void