AC-8767::ES 7 deprecation and ES 8 upgrade

Author: glo71317

app/code/Magento/Elasticsearch/Test/Unit/ElasticAdapter/Model/Adapter/Index/IndexNameResolverTest.php renamed to app/code/Magento/Elasticsearch7/Test/Unit/Model/Adapter/IndexNameResolverTest.php

@@ -5,7 +5,7 @@
  */
 declare(strict_types=1);
 
-namespace Magento\Elasticsearch\Test\Unit\ElasticAdapter\Model\Adapter\Index;
+namespace Magento\Elasticsearch7\Test\Unit\Model\Adapter;
 
 use Elasticsearch\Client;
 use Elasticsearch\Namespaces\IndicesNamespace;

app/code/Magento/Elasticsearch/Test/Unit/Setup/InstallConfigTest.php renamed to app/code/Magento/Elasticsearch7/Test/Unit/Setup/InstallConfigTest.php

@@ -5,7 +5,7 @@
  */
 declare(strict_types=1);
 
-namespace Magento\Elasticsearch\Test\Unit\Setup;
+namespace Magento\Elasticsearch7\Test\Unit\Setup;
 
 use Magento\Framework\App\Config\Storage\WriterInterface;
 use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;

app/code/Magento/Elasticsearch/Test/Unit/Setup/ValidatorTest.php renamed to app/code/Magento/Elasticsearch7/Test/Unit/Setup/ValidatorTest.php

@@ -5,7 +5,7 @@
  */
 declare(strict_types=1);
 
-namespace Magento\Elasticsearch\Test\Unit\Setup;
+namespace Magento\Elasticsearch7\Test\Unit\Setup;
 
 use Magento\AdvancedSearch\Model\Client\ClientResolver;
 use Magento\Elasticsearch\Setup\Validator;