FrontTabPlugin.php

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<?php
namespace Magento\CatalogSearch\Block\Plugin;

use Magento\Catalog\Block\Adminhtml\Product\Attribute\Edit\Tab\Front as ProductAttributeFrontTabBlock;
use Magento\CatalogSearch\Model\Source\Weight;
use Magento\Framework\Data\Form;
use Magento\Framework\Data\Form\Element\Fieldset;

class FrontTabPlugin
{
    private $weightSource;

    public function __construct(Weight $weightSource)
    {
        $this->weightSource = $weightSource;
    }

    public function beforeSetForm(ProductAttributeFrontTabBlock $subject, Form $form)
    {
        $fieldset = $form->getElement('front_fieldset');
        $fieldset->addField(
            'search_weight',
            'select',
            [
                'name' => 'search_weight',
                'label' => __('Search Weight'),
                'values' => $this->weightSource->getOptions()
            ],
            'is_searchable'
        );
        $subject->getChildBlock('form_after')
            ->addFieldMap('search_weight', 'search_weight')
            ->addFieldDependence('search_weight', 'searchable', '1');
    }
}