Just an extension helper.

src/Squidex.Domain.Apps.Entities/Contents/Text/Extensions.cs

@@ -0,0 +1,21 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using Lucene.Net.Documents;
+using Lucene.Net.Util;
+
+namespace Squidex.Domain.Apps.Entities.Contents.Text
+{
+    public static class Extensions
+    {
+        public static void SetBinaryDocValue(this Document document, string name, BytesRef value)
+        {
+            document.RemoveField(name);
+            document.AddBinaryDocValuesField(name, value);
+        }
+    }
+}

src/Squidex.Domain.Apps.Entities/Contents/Text/IndexState.cs

@@ -40,8 +40,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Text
         {
             var value = GetValue(forDraft, forPublished);
 
-            document.RemoveField(MetaFor);
-            document.AddBinaryDocValuesField(MetaFor, value);
+            document.SetBinaryDocValue(MetaFor, value);
 
             changes[(id, draft)] = value;
         }