MAGETWO-98592: [Elastic] Fix catalog search with elasticsearch6

Author: vgoncharenko

app/code/Magento/Elasticsearch6/etc/di.xml

@@ -170,4 +170,36 @@
             </argument>
         </arguments>
     </type>
+
+    <virtualType name="elasticsearchLayerCategoryItemCollectionProvider" type="Magento\Elasticsearch\Model\Layer\Category\ItemCollectionProvider">
+        <arguments>
+            <argument name="factories" xsi:type="array">
+                <item name="elasticsearch6" xsi:type="object">elasticsearchCategoryCollectionFactory</item>
+            </argument>
+        </arguments>
+    </virtualType>
+
+    <type name="Magento\CatalogSearch\Model\Search\ItemCollectionProvider">
+        <arguments>
+            <argument name="factories" xsi:type="array">
+                <item name="elasticsearch6" xsi:type="object">elasticsearchAdvancedCollectionFactory</item>
+            </argument>
+        </arguments>
+    </type>
+
+    <type name="Magento\CatalogSearch\Model\Advanced\ProductCollectionPrepareStrategyProvider">
+        <arguments>
+            <argument name="strategies" xsi:type="array">
+                <item name="elasticsearch6" xsi:type="object">Magento\Elasticsearch\Model\Advanced\ProductCollectionPrepareStrategy</item>
+            </argument>
+        </arguments>
+    </type>
+
+    <virtualType name="elasticsearchLayerSearchItemCollectionProvider" type="Magento\Elasticsearch\Model\Layer\Search\ItemCollectionProvider">
+        <arguments>
+            <argument name="factories" xsi:type="array">
+                <item name="elasticsearch6" xsi:type="object">elasticsearchFulltextSearchCollectionFactory</item>
+            </argument>
+        </arguments>
+    </virtualType>
 </config>