Description

With fields of types Name Value List and Name Lookup Value List, it is possible to reference items by ID. If the selected IDs are stored without curly brackets, then the field value cannot be indexed. The following message can be found in the Crawling logs:

FATAL Could not add field {6AC5BD92-75AE-4EF8-9D9E-BA61A96762B0} : fieldname for indexable sitecore://master/{110D559F-DEA5-42EA-9C1C-8A5DF7E70EF9}?lang=en&ver=1
Exception: System.ArgumentOutOfRangeException
Message: Index and length must refer to a location within the string.
Parameter name: length
Source: mscorlib
   at System.String.Substring(Int32 startIndex, Int32 length)
   at Sitecore.Data.ShortID.Encode(String guid)
   at Sitecore.ContentSearch.FieldReaders.NameValueListFieldReader.GetFieldValue(IIndexableDataField indexableField)
   at Sitecore.ContentSearch.FieldReaders.FieldReaderMap.GetFieldValue(IIndexableDataField field)
   at Sitecore.ContentSearch.SolrProvider.SolrDocumentBuilder.AddField(IIndexableDataField field)
   at Sitecore.ContentSearch.AbstractDocumentBuilder`1.CheckAndAddField(IIndexable indexable, IIndexableDataField field)

Solution

To resolve the issue, upgrade your solution to Sitecore XP 10.3.0 or later.

Alternatively, to prevent the issue, consider one of the following options:

• Since the correct ID format is expected to be "{GUID}", update the Name (Lookup) Value List field values, so that GUIDs are put in curly brackets.

  Note: To check the raw value of the field, click the Raw values check box on the View tab.

• You can follow the customization steps below. Note that the code sample is given only as a starting point.
  1. Create a CustomNameValueListFieldReader class and build it into an assembly:

     using System.Collections.Generic;
     using System.Collections.Specialized;
     using Sitecore.Abstractions;
     using Sitecore.ContentSearch;
     using Sitecore.ContentSearch.FieldReaders;
     using Sitecore.Data;
     using Sitecore.Data.Fields;
     using Sitecore.Diagnostics;
     using Sitecore.Web;
     
     public class CustomNameValueListFieldReader : FieldReader
     {
     	public override object GetFieldValue(IIndexableDataField indexableField)
     	{
     		Field field = indexableField as SitecoreItemDataField;
     		List<string> list = new List<string>();
     		BaseFieldTypeManager instance = ContentSearchManager.Locator.GetInstance<BaseFieldTypeManager>();
     		Assert.IsNotNull(instance, "fieldTypeManager != null");
     		NameValueListField nameValueListField = instance.GetField(field) as NameValueListField;
     		if (nameValueListField != null)
     		{
     			NameValueCollection nameValueCollection = WebUtil.ParseUrlParameters(field.Value);
     			{
     				foreach (string item in nameValueCollection)
     				{
     					string text = nameValueCollection[item];
     					if (ID.IsID(text))
     					{
     						// Treat GUIDs without curly braces as text
     						text = (text.Length != 38) ? text.Replace("-", "").ToLowerInvariant() : ShortID.Encode(text).ToLowerInvariant();
     					}
     					
     					list.Add(text);
     				}
     				
     				return list;
     			}
     		}
     		
     		return list;
     	}
     }

  2. Put the assembly in the \bin folder of the website.
  3. To replace the default Sitecore.ContentSearch.FieldReaders.NameValueListFieldReader with the custom one, create a configuration patch file in the \App_Config\Include\zzz folder:

     <?xml version="1.0" encoding="utf-8" ?>
     <configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" xmlns:role="http://www.sitecore.net/xmlconfig/role/" xmlns:search="http://www.sitecore.net/xmlconfig/search/" xmlns:set="http://www.sitecore.net/xmlconfig/set/" >
       <sitecore role:require="Standalone or ContentManagement or ContentDelivery" search:require="solr">
         <contentSearch>
           <indexConfigurations>
             <defaultSolrIndexConfiguration>
     	  <fieldReaders>
     	    <mapFieldByTypeName>
     	      <fieldReader fieldTypeName="name lookup value list|name value list" set:fieldReaderType="CustomNamespace.CustomNameValueListFieldReader, CustomAssembly" />
     	    </mapFieldByTypeName>
     	  </fieldReaders>
             </defaultSolrIndexConfiguration>
           </indexConfigurations>
         </contentSearch>
       </sitecore>
     </configuration>