SearchWeight.php

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<?php
namespace Magento\CatalogSearch\Model\Attribute;

class SearchWeight
{
    public function __construct(
        \Magento\Framework\Search\Request\Config $config
    ) {
        $this->config = $config;
    }

    public function aroundSave(
        \Magento\Catalog\Model\ResourceModel\Attribute $subject,
        \Closure $proceed,
        \Magento\Framework\Model\AbstractModel $attribute
    ) {
        $isNew = $attribute->isObjectNew();
        $isWeightChanged = $attribute->dataHasChangedFor('search_weight');

        $result = $proceed($attribute);
        if ($isNew || $isWeightChanged) {
            $this->config->reset();
        }

        return $result;
    }
}