MC-21962: Catalog Pagination doesn't work on Elasticsearch 6.x

- fix static tests

Author: vgoncharenko

app/code/Magento/CatalogSearch/Model/ResourceModel/Advanced/Collection.php

@@ -44,7 +44,7 @@ class Collection extends \Magento\Catalog\Model\ResourceModel\Product\Collection
     /**
      * Config search engine path.
      */
-    const SEARCH_ENGINE_VALUE_PATH = 'catalog/search/engine';
+    private const SEARCH_ENGINE_VALUE_PATH = 'catalog/search/engine';
 
     /**
      * List Of filters

app/code/Magento/CatalogSearch/Model/ResourceModel/Fulltext/Collection.php

@@ -45,7 +45,7 @@ class Collection extends \Magento\Catalog\Model\ResourceModel\Product\Collection
     /**
      * Config search engine path.
      */
-    const SEARCH_ENGINE_VALUE_PATH = 'catalog/search/engine';
+    private const SEARCH_ENGINE_VALUE_PATH = 'catalog/search/engine';
 
     /**
      * @var  QueryResponse