diff --git a/config/services/search-index-adapter/open-search.yaml b/config/services/search-index-adapter/open-search.yaml
index 314f1d5b..0b7dec71 100644
--- a/config/services/search-index-adapter/open-search.yaml
+++ b/config/services/search-index-adapter/open-search.yaml
@@ -46,6 +46,8 @@ services:
 
     Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\IndexStatsServiceInterface:
         class: Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\OpenSearch\IndexStatsService
+        arguments:
+            $openSearchClient: '@generic-data-index.opensearch-client'
 
     Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\IndexMappingServiceInterface:
         class: Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\OpenSearch\IndexMappingService
diff --git a/config/services/search/data-object/field-definition-adapters.yml b/config/services/search/data-object/field-definition-adapters.yml
index 6d9389d7..787860fe 100644
--- a/config/services/search/data-object/field-definition-adapters.yml
+++ b/config/services/search/data-object/field-definition-adapters.yml
@@ -48,6 +48,10 @@ services:
         shared: false
         tags:
             - { name: "pimcore.generic_data_index.data-object.search_index_field_definition", type: "quantityValue" }
+
+    Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\OpenSearch\DataObject\FieldDefinitionAdapter\InputQuantityValueAdapter:
+        shared: false
+        tags:
             - { name: "pimcore.generic_data_index.data-object.search_index_field_definition", type: "inputQuantityValue" }
 
     Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\OpenSearch\DataObject\FieldDefinitionAdapter\BooleanAdapter:
diff --git a/src/SearchIndexAdapter/OpenSearch/DataObject/FieldDefinitionAdapter/InputQuantityValueAdapter.php b/src/SearchIndexAdapter/OpenSearch/DataObject/FieldDefinitionAdapter/InputQuantityValueAdapter.php
new file mode 100644
index 00000000..9ddfd686
--- /dev/null
+++ b/src/SearchIndexAdapter/OpenSearch/DataObject/FieldDefinitionAdapter/InputQuantityValueAdapter.php
@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Pimcore
+ *
+ * This source file is available under two different licenses:
+ * - GNU General Public License version 3 (GPLv3)
+ * - Pimcore Commercial License (PCL)
+ * Full copyright and license information is available in
+ * LICENSE.md which is distributed with this source code.
+ *
+ *  @copyright  Copyright (c) Pimcore GmbH (http://www.pimcore.org)
+ *  @license    http://www.pimcore.org/license     GPLv3 and PCL
+ */
+
+namespace Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\OpenSearch\DataObject\FieldDefinitionAdapter;
+
+use Pimcore\Bundle\GenericDataIndexBundle\Enum\SearchIndex\OpenSearch\AttributeType;
+
+/**
+ * @internal
+ */
+final class InputQuantityValueAdapter extends AbstractAdapter
+{
+    public function getIndexMapping(): array
+    {
+        return [
+            'properties' => [
+                'value' => [
+                    'type' => AttributeType::KEYWORD->value,
+                ],
+                'unitId' => [
+                    'type' => AttributeType::TEXT->value,
+                ],
+            ],
+        ];
+    }
+}
diff --git a/src/SearchIndexAdapter/OpenSearch/IndexStatsService.php b/src/SearchIndexAdapter/OpenSearch/IndexStatsService.php
index dcaa71d4..04bc100c 100644
--- a/src/SearchIndexAdapter/OpenSearch/IndexStatsService.php
+++ b/src/SearchIndexAdapter/OpenSearch/IndexStatsService.php
@@ -17,6 +17,7 @@
 namespace Pimcore\Bundle\GenericDataIndexBundle\SearchIndexAdapter\OpenSearch;
 
 use Exception;
+use OpenSearch\Client;
 use Pimcore\Bundle\GenericDataIndexBundle\Model\Stats\IndexStats;
 use Pimcore\Bundle\GenericDataIndexBundle\Model\Stats\IndexStatsIndex;
 use Pimcore\Bundle\GenericDataIndexBundle\Repository\IndexQueueRepository;
@@ -30,9 +31,10 @@ final class IndexStatsService implements IndexStatsServiceInterface
     use LoggerAwareTrait;
 
     public function __construct(
-        protected readonly SearchIndexConfigServiceInterface $searchIndexConfigService,
-        protected readonly IndexQueueRepository $indexQueueRepository,
-        protected readonly SearchIndexServiceInterface $openSearchService,
+        private readonly SearchIndexConfigServiceInterface $searchIndexConfigService,
+        private readonly IndexQueueRepository $indexQueueRepository,
+        private readonly SearchIndexServiceInterface $openSearchService,
+        private readonly Client $openSearchClient,
     ) {
     }
 
@@ -43,12 +45,31 @@ public function getStats(): IndexStats
             $this->searchIndexConfigService->getIndexPrefix() . '*'
         );
 
+        $aggregationResult = $this->openSearchClient->search([
+            'index' => $this->searchIndexConfigService->getIndexPrefix() . '*',
+            'body' => [
+                'size' => 0,
+                'aggs' => [
+                    'indices' => [
+                        'terms' => [
+                            'field' => '_index',
+                            'size' => 10000,
+                            'order' => [
+                                '_key' => 'asc',
+                            ],
+                        ],
+                    ],
+                ],
+            ],
+        ]);
+
         $indices = [];
-        foreach ($allStats['indices'] as $indexName => $index) {
+        foreach ($aggregationResult['aggregations']['indices']['buckets'] as $bucket) {
+            $sizeInBytes = (int)($allStats['indices'][$bucket['key']]['total']['store']['size_in_bytes'] ?? 0);
             $indices[] = new IndexStatsIndex(
-                indexName: $indexName,
-                itemsCount: $index['total']['docs']['count'],
-                sizeInKb: round(((int)$index['total']['store']['size_in_bytes'] / 1024), 2)
+                indexName: $bucket['key'],
+                itemsCount: $bucket['doc_count'],
+                sizeInKb: round(($sizeInBytes / 1024), 2)
             );
         }