Varnish.php

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<?php
namespace Magento\PageCache\Model\System\Config\Backend;

class Varnish extends \Magento\Framework\App\Config\Value
{
    protected $defaultValues;

    public function beforeSave()
    {
        $data = $this->_getDefaultValues();
        $currentValue = $this->getValue();
        if (!$currentValue) {
            $replaceValue = isset($data[$this->getField()]) ? $data[$this->getField()] : false;
            $this->setValue($replaceValue);
        }
        return $this;
    }

    protected function _getDefaultValues()
    {
        if (!$this->defaultValues) {
            $this->defaultValues = $this->_config->getValue('system/full_page_cache/default');
        }
        return $this->defaultValues;
    }

    protected function _afterLoad()
    {
        $data = $this->_getDefaultValues();
        $currentValue = $this->getValue();
        if (!$currentValue) {
            foreach ($data as $field => $value) {
                if (strstr($this->getPath(), $field)) {
                    $this->setValue($value);
                    $this->save();
                    break;
                }
            }
        }
        return $this;
    }
}