ENGCOM-6232: Elastic Search 5 Indexing Performance Issue with product mapper #25452

Author: VladimirZaets

app/code/Magento/Elasticsearch/Model/Adapter/BatchDataMapper/ProductDataMapper.php

@@ -272,9 +272,14 @@ private function prepareAttributeValues(
      */
     private function prepareMultiselectValues(array $values): array
     {
-        return \array_merge(...\array_map(function (string $value) {
-            return \explode(',', $value);
-        }, $values));
+        return \array_merge(
+            ...\array_map(
+                function (string $value) {
+                    return \explode(',', $value);
+                },
+                $values
+            )
+        );
     }
 
     /**
@@ -305,9 +310,9 @@ private function getValuesLabels(Attribute $attribute, array $attributeValues):
             return $attributeLabels;
         }
 
-        foreach ($options as $option) {
-            if (\in_array($option->getValue(), $attributeValues)) {
-                $attributeLabels[] = $option->getLabel();
+        foreach ($attributeValues as $attributeValue) {
+            if (isset($options[$attributeValue])) {
+                $attributeLabels[] = $options[$attributeValue]->getLabel();
             }
         }
 
@@ -324,7 +329,11 @@ private function getAttributeOptions(Attribute $attribute): array
     {
         if (!isset($this->attributeOptionsCache[$attribute->getId()])) {
             $options = $attribute->getOptions() ?? [];
-            $this->attributeOptionsCache[$attribute->getId()] = $options;
+            $optionsByValue = [];
+            foreach ($options as $option) {
+                $optionsByValue[$option->getValue()] = $option;
+            }
+            $this->attributeOptionsCache[$attribute->getId()] = $optionsByValue;
         }
 
         return $this->attributeOptionsCache[$attribute->getId()];