Attribute.php

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<?php
namespace Magento\CatalogSearch\Model\Layer\Filter;

use Magento\Catalog\Model\Layer\Filter\AbstractFilter;

class Attribute extends AbstractFilter
{
    private $tagFilter;

    public function __construct(
        \Magento\Catalog\Model\Layer\Filter\ItemFactory $filterItemFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Catalog\Model\Layer $layer,
        \Magento\Catalog\Model\Layer\Filter\Item\DataBuilder $itemDataBuilder,
        \Magento\Framework\Filter\StripTags $tagFilter,
        array $data = []
    ) {
        parent::__construct(
            $filterItemFactory,
            $storeManager,
            $layer,
            $itemDataBuilder,
            $data
        );
        $this->tagFilter = $tagFilter;
    }

    public function apply(\Magento\Framework\App\RequestInterface $request)
    {
        $attributeValue = $request->getParam($this->_requestVar);
        if (empty($attributeValue) && !is_numeric($attributeValue)) {
            return $this;
        }
        $attribute = $this->getAttributeModel();
        $productCollection = $this->getLayer()
            ->getProductCollection();
        $productCollection->addFieldToFilter($attribute->getAttributeCode(), $attributeValue);
        $label = $this->getOptionText($attributeValue);
        $this->getLayer()
            ->getState()
            ->addFilter($this->_createItem($label, $attributeValue));

        $this->setItems([]); // set items to disable show filtering
        return $this;
    }

    protected function _getItemsData()
    {
        $attribute = $this->getAttributeModel();
        $productCollection = $this->getLayer()
            ->getProductCollection();
        $optionsFacetedData = $productCollection->getFacetedData($attribute->getAttributeCode());

        $isAttributeFilterable =
            $this->getAttributeIsFilterable($attribute) === static::ATTRIBUTE_OPTIONS_ONLY_WITH_RESULTS;

        if (count($optionsFacetedData) === 0 && !$isAttributeFilterable) {
            return $this->itemDataBuilder->build();
        }

        $productSize = $productCollection->getSize();

        $options = $attribute->getFrontend()
            ->getSelectOptions();
        foreach ($options as $option) {
            $this->buildOptionData($option, $isAttributeFilterable, $optionsFacetedData, $productSize);
        }

        return $this->itemDataBuilder->build();
    }

    private function buildOptionData($option, $isAttributeFilterable, $optionsFacetedData, $productSize)
    {
        $value = $this->getOptionValue($option);
        if ($value === false) {
            return;
        }
        $count = $this->getOptionCount($value, $optionsFacetedData);
        if ($isAttributeFilterable && (!$this->isOptionReducesResults($count, $productSize) || $count === 0)) {
            return;
        }

        $this->itemDataBuilder->addItemData(
            $this->tagFilter->filter($option['label']),
            $value,
            $count
        );
    }

    private function getOptionValue($option)
    {
        if (empty($option['value']) && !is_numeric($option['value'])) {
            return false;
        }
        return $option['value'];
    }

    private function getOptionCount($value, $optionsFacetedData)
    {
        return isset($optionsFacetedData[$value]['count'])
            ? (int)$optionsFacetedData[$value]['count']
            : 0;
    }
}