ProductAttributeGridBuildObserver.php

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<?php
namespace Magento\LayeredNavigation\Observer\Grid;

use Magento\Framework\Module\Manager;
use Magento\Framework\Event\ObserverInterface;

class ProductAttributeGridBuildObserver implements ObserverInterface
{
    protected $moduleManager;

    public function __construct(Manager $moduleManager)
    {
        $this->moduleManager = $moduleManager;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if (!$this->moduleManager->isOutputEnabled('Magento_LayeredNavigation')) {
            return;
        }

        $grid = $observer->getGrid();

        $grid->addColumnAfter(
            'is_filterable',
            [
                    'header' => __('Use in Layered Navigation'),
                    'sortable' => true,
                    'index' => 'is_filterable',
                    'type' => 'options',
                    'options' => [
                        '1' => __('Filterable (with results)'),
                        '2' => __('Filterable (no results)'),
                        '0' => __('No'),
                    ],
                    'align' => 'center',
            ],
            'is_searchable'
        );
    }
}