diff --git a/src/module-elasticsuite-core/Model/Healthcheck/ShardsConfigCheck.php b/src/module-elasticsuite-core/Model/Healthcheck/ShardsConfigCheck.php
index 56954a76d..a1c237789 100644
--- a/src/module-elasticsuite-core/Model/Healthcheck/ShardsConfigCheck.php
+++ b/src/module-elasticsuite-core/Model/Healthcheck/ShardsConfigCheck.php
@@ -44,7 +44,7 @@ class ShardsConfigCheck implements CheckInterface
 
     public const WARNING_STATUS = 'warning';
 
-    public const UNDEFINED_SIZE = 'undefined';
+    public const UNDEFINED_SIZE = 'N/A';
 
     /**
      * @var IndexSettingsHelper