AC-13818::Make ES8 to be default for 2.4.8 instead of ES7

Author: glo71317

app/code/Magento/Elasticsearch8/etc/config.xml

@@ -9,7 +9,6 @@
     <default>
         <catalog>
             <search>
-                <engine>elasticsearch8</engine>
                 <elasticsearch8_server_hostname>localhost</elasticsearch8_server_hostname>
                 <elasticsearch8_server_port>9200</elasticsearch8_server_port>
                 <elasticsearch8_index_prefix>magento2</elasticsearch8_index_prefix>

app/code/Magento/Elasticsearch8/etc/di.xml

@@ -6,6 +6,7 @@
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <preference for="Magento\Elasticsearch\Model\Adapter\Elasticsearch" type="Magento\Elasticsearch8\Model\Adapter\Elasticsearch"/>
     <type name="Magento\Elasticsearch\Model\Config">
         <arguments>
             <argument name="engineList" xsi:type="array">
@@ -14,6 +15,22 @@
         </arguments>
     </type>
 
+    <type name="Magento\Elasticsearch\Model\Adapter\Elasticsearch">
+        <arguments>
+            <argument name="responseErrorExceptionList" xsi:type="array">
+                <item name="clientResponseException" xsi:type="string">Elastic\Elasticsearch\Exception\ClientResponseException</item>
+            </argument>
+        </arguments>
+    </type>
+
+    <type name="Magento\Elasticsearch\Model\DataProvider\Base\Suggestions">
+        <arguments>
+            <argument name="responseErrorExceptionList" xsi:type="array">
+                <item name="clientResponseException" xsi:type="string">Elastic\Elasticsearch\Exception\ClientResponseException</item>
+            </argument>
+        </arguments>
+    </type>
+
     <type name="Magento\Search\Model\Adminhtml\System\Config\Source\Engine">
         <arguments>
             <argument name="engines" xsi:type="array">