Add fulltext/keyword search field for product admin grid

app/code/Magento/CatalogSearch/Ui/DataProvider/Product/AddFulltextFilterToCollection.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\CatalogSearch\Ui\DataProvider\Product;
+
+use Magento\Framework\Data\Collection;
+use Magento\CatalogSearch\Model\ResourceModel\Search\Collection as SearchCollection;
+use Magento\Ui\DataProvider\AddFilterToCollectionInterface;
+
+/**
+ * Class AddFulltextFilterToCollection
+ */
+class AddFulltextFilterToCollection implements AddFilterToCollectionInterface
+{
+    /**
+     * Search Collection
+     *
+     * @var SearchCollection
+     */
+    private $searchCollection;
+
+    /**
+     * @param SearchCollection $searchCollection
+     */
+    public function __construct(SearchCollection $searchCollection)
+    {
+        $this->searchCollection = $searchCollection;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function addFilter(Collection $collection, $field, $condition = null)
+    {
+        /** @var $collection \Magento\Catalog\Model\ResourceModel\Product\Collection */
+        if (isset($condition['fulltext']) && !empty($condition['fulltext'])) {
+            $this->searchCollection->addBackendSearchFilter($condition['fulltext']);
+            $productIds = $this->searchCollection->load()->getAllIds();
+            $collection->addIdFilter($productIds);
+        }
+    }
+}

app/code/Magento/CatalogSearch/composer.json

@@ -11,6 +11,7 @@
         "magento/module-eav": "100.2.*",
         "magento/module-backend": "100.2.*",
         "magento/module-theme": "100.2.*",
+        "magento/module-ui": "100.2.*",
         "magento/module-catalog-inventory": "100.2.*",
         "magento/framework": "100.2.*"
     },

app/code/Magento/CatalogSearch/etc/adminhtml/di.xml

@@ -19,4 +19,11 @@
     <type name="Magento\Catalog\Block\Adminhtml\Product\Attribute\Edit\Tab\Front">
         <plugin name="search_weigh" type="Magento\CatalogSearch\Block\Plugin\FrontTabPlugin" />
     </type>
+    <type name="Magento\Catalog\Ui\DataProvider\Product\ProductDataProvider">
+        <arguments>
+            <argument name="addFilterStrategies" xsi:type="array">
+                <item name="fulltext" xsi:type="object">Magento\CatalogSearch\Ui\DataProvider\Product\AddFulltextFilterToCollection</item>
+            </argument>
+        </arguments>
+    </type>
 </config>

app/code/Magento/CatalogSearch/view/adminhtml/ui_component/product_listing.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<listing xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
+    <listingToolbar name="listing_top">
+        <filterSearch name="fulltext"/>
+    </listingToolbar>
+</listing>