ENGCOM-4389: Elasticsearch6 implementation

 - Fixed removing out of stock items from ES index

Author: ishakhsuvarov

app/code/Magento/Elasticsearch/Model/Config.php

@@ -25,8 +25,6 @@ class Config implements ClientOptionsInterface
      */
     const ENGINE_NAME = 'elasticsearch';
 
-    private const ENGINE_NAME_5 = 'elasticsearch5';
-
     /**
      * Elasticsearch Entity type
      */
@@ -64,23 +62,31 @@ class Config implements ClientOptionsInterface
     private $engineResolver;
 
     /**
-     * Constructor
+     * Available Elasticsearch engines.
      *
+     * @var array
+     */
+    private $engineList;
+
+    /**
      * @param ScopeConfigInterface $scopeConfig
      * @param ClientResolver|null $clientResolver
      * @param EngineResolverInterface|null $engineResolver
      * @param string|null $prefix
+     * @param array $engineList
      */
     public function __construct(
         ScopeConfigInterface $scopeConfig,
         ClientResolver $clientResolver = null,
         EngineResolverInterface $engineResolver = null,
-        $prefix = null
+        $prefix = null,
+        $engineList = []
     ) {
         $this->scopeConfig = $scopeConfig;
         $this->clientResolver = $clientResolver ?: ObjectManager::getInstance()->get(ClientResolver::class);
         $this->engineResolver = $engineResolver ?: ObjectManager::getInstance()->get(EngineResolverInterface::class);
         $this->prefix = $prefix ?: $this->clientResolver->getCurrentEngine();
+        $this->engineList = $engineList;
     }
 
     /**
@@ -138,7 +144,7 @@ public function getSearchConfigData($field, $storeId = null)
      */
     public function isElasticsearchEnabled()
     {
-        return in_array($this->engineResolver->getCurrentSearchEngine(), [self::ENGINE_NAME, self::ENGINE_NAME_5]);
+        return in_array($this->engineResolver->getCurrentSearchEngine(), $this->engineList);
     }
 
     /**

app/code/Magento/Elasticsearch/etc/di.xml

@@ -13,6 +13,14 @@
     <preference for="Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldIndex\ConverterInterface" type="Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldIndex\Converter" />
     <preference for="Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldType\ConverterInterface" type="Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldType\Converter" />
     <preference for="Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProviderInterface" type="Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\CompositeFieldProvider" />
+    <type name="Magento\Elasticsearch\Model\Config">
+        <arguments>
+            <argument name="engineList" xsi:type="array">
+                <item name="elasticsearch" xsi:type="string">elasticsearch</item>
+                <item name="elasticsearch5" xsi:type="string">elasticsearch5</item>
+            </argument>
+        </arguments>
+    </type>
     <type name="Magento\Elasticsearch\Model\Adapter\FieldMapper\FieldMapperResolver">
         <arguments>
             <argument name="fieldMappers" xsi:type="array">

app/code/Magento/Elasticsearch6/Model/Config.php

@@ -9,7 +9,7 @@
 use Magento\Store\Model\ScopeInterface;
 use Magento\Search\Model\QueryInterface;
 use Magento\AdvancedSearch\Model\SuggestedQueriesInterface;
-use Magento\Elasticsearch6\Model\Config;
+use Magento\Elasticsearch\Model\Config;
 use Magento\Elasticsearch\SearchAdapter\ConnectionManager;
 use Magento\Search\Model\QueryResultFactory;
 use Magento\Framework\App\Config\ScopeConfigInterface;

app/code/Magento/Elasticsearch6/Model/DataProvider/Suggestions.php

@@ -67,7 +67,7 @@ class SuggestionsTest extends \PHPUnit\Framework\TestCase
      */
     protected function setUp()
     {
-        $this->config = $this->getMockBuilder(\Magento\Elasticsearch6\Model\Config::class)
+        $this->config = $this->getMockBuilder(\Magento\Elasticsearch\Model\Config::class)
             ->disableOriginalConstructor()
             ->setMethods(['isElasticsearchEnabled'])
             ->getMock();

app/code/Magento/Elasticsearch6/Test/Unit/Model/DataProvider/SuggestionsTest.php

@@ -6,6 +6,14 @@
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <type name="Magento\Elasticsearch\Model\Config">
+        <arguments>
+            <argument name="engineList" xsi:type="array">
+                <item name="elasticsearch6" xsi:type="string">elasticsearch6</item>
+            </argument>
+        </arguments>
+    </type>
+
     <type name="Magento\Search\Model\Adminhtml\System\Config\Source\Engine">
         <arguments>
             <argument name="engines" xsi:type="array">