MC-18948: Switch default search engine from MySQL to ElasticSearch

- remove mysql strategy

Author: cpartica

app/code/Magento/CatalogSearch/Model/Advanced/ProductCollectionPrepareStrategy.php

@@ -12,6 +12,7 @@
 
 /**
  * Strategy interface for preparing product collection.
+ * @deprecated See elastic search strategy
  */
 class ProductCollectionPrepareStrategy implements ProductCollectionPrepareStrategyInterface
 {

app/code/Magento/CatalogSearch/Model/Advanced/ProductCollectionPrepareStrategyProvider.php

@@ -38,11 +38,16 @@ public function __construct(
      * Get strategy provider for product collection prepare process.
      *
      * @return ProductCollectionPrepareStrategyInterface
+     * @throws \Exception
      */
     public function getStrategy(): ProductCollectionPrepareStrategyInterface
     {
         if (!isset($this->strategies[$this->engineResolver->getCurrentSearchEngine()])) {
-            return $this->strategies['default'];
+            if ($this->strategies['default']) {
+                return $this->strategies['default'];
+            } else {
+                throw new \Exception('Default product collection strategy not found');
+            }
         }
         return $this->strategies[$this->engineResolver->getCurrentSearchEngine()];
     }

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

@@ -208,14 +208,6 @@
             </argument>
         </arguments>
     </type>
-    <type name="Magento\CatalogSearch\Model\Advanced\ProductCollectionPrepareStrategyProvider">
-        <arguments>
-            <argument name="strategies" xsi:type="array">
-                <item name="default" xsi:type="object">Magento\CatalogSearch\Model\Advanced\ProductCollectionPrepareStrategy</item>
-                <item name="mysql" xsi:type="object">Magento\CatalogSearch\Model\Advanced\ProductCollectionPrepareStrategy</item>
-            </argument>
-        </arguments>
-    </type>
     <virtualType name="Magento\CatalogSearch\Model\Layer\Category\Context" type="Magento\Catalog\Model\Layer\Category\Context">
         <arguments>
             <argument name="collectionProvider" xsi:type="object">Magento\CatalogSearch\Model\Layer\Category\ItemCollectionProvider</argument>

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

@@ -110,6 +110,7 @@
     <type name="Magento\CatalogSearch\Model\Advanced\ProductCollectionPrepareStrategyProvider">
         <arguments>
             <argument name="strategies" xsi:type="array">
+                <item name="default" xsi:type="object">Magento\Elasticsearch\Model\Advanced\ProductCollectionPrepareStrategy</item>
                 <item name="elasticsearch5" xsi:type="object">Magento\Elasticsearch\Model\Advanced\ProductCollectionPrepareStrategy</item>
             </argument>
         </arguments>