MC-41647: SKU Search very slow on Admin Panel

Author: Oleksandr Iegorov

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

@@ -211,11 +211,25 @@ private function prepareIndexEnforcements() : array
         $result = [];
         foreach (self::INDEX_USAGE_ENFORCEMENTS as $table => $index) {
             $table = $this->getTable($table);
-            $result[$table] = $index;
+            if ($this->isIndexExists($table, $index)) {
+                $result[$table] = $index;
+            }
         }
         return $result;
     }
 
+    /**
+     * Check if index exists in the table
+     *
+     * @param string $table
+     * @param string $index
+     * @return bool
+     */
+    private function isIndexExists(string $table, string $index) : bool
+    {
+        return array_key_exists($index, $this->_conn->getIndexList($table));
+    }
+
     /**
      * Retrieve SQL for search entities
      *