diff --git a/src/IndexService/Config/AbstractConfig.php b/src/IndexService/Config/AbstractConfig.php
index e416de89..867e55a3 100644
--- a/src/IndexService/Config/AbstractConfig.php
+++ b/src/IndexService/Config/AbstractConfig.php
@@ -26,23 +26,23 @@ abstract class AbstractConfig implements ConfigInterface
 {
     protected string $tenantName;
 
-    protected array $attributeConfig;
+    protected array $attributeConfig = [];
 
-    protected array $searchAttributeConfig;
+    protected array $searchAttributeConfig = [];
 
     protected ?AttributeFactory $attributeFactory = null;
 
     protected array $attributes = [];
 
-    protected array $searchAttributes;
+    protected array $searchAttributes = [];
 
-    protected array $filterTypes;
+    protected array $filterTypes = [];
 
     protected ?WorkerInterface $tenantWorker = null;
 
     protected ?array $filterTypeConfig = null;
 
-    protected array $options;
+    protected array $options = [];
 
     /**
      * @param array[]|Attribute[] $attributes
diff --git a/src/IndexService/Config/ElasticSearch.php b/src/IndexService/Config/ElasticSearch.php
index 33fae084..23c1f447 100644
--- a/src/IndexService/Config/ElasticSearch.php
+++ b/src/IndexService/Config/ElasticSearch.php
@@ -75,9 +75,9 @@ class ElasticSearch extends AbstractConfig implements MockupConfigInterface, Ela
     public function __construct(
         AttributeFactory $attributeFactory,
         string $tenantName,
-        array $attributes,
-        array $searchAttributes,
-        array $filterTypes,
+        array $attributes = [],
+        array $searchAttributes = [],
+        array $filterTypes = [],
         array $options = [],
         iterable $synonymProviders = []
     ) {