boostrap.cs

public class Bootstrap : ApplicationEventHandler
{
    protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        ExamineManager.Instance.IndexProviderCollection["ExternalIndexer"].GatheringNodeData += (sender, e) =>
        {
          // Extract JSON properties
          var fieldKeys = e.Fields.Keys.ToArray();
          foreach (var key in fieldKeys)
          {
              var value = e.Fields[key];
              if (value.DetectIsJson())
              {
                  IndexNestedObject(e.Fields, JsonConvert.DeserializeObject(value), key);
              }
          }
          
          // Stuff all the fields into a single field for easier searching
          var combinedFields = new StringBuilder();
          foreach (var keyValuePair in e.Fields)
          {
              combinedFields.AppendLine(keyValuePair.Value);
          }
          e.Fields.Add("contents", combinedFields.ToString());
        }
    }
    
    private void IndexNestedObject(Dictionary<string, string> fields, object obj, string prefix)
    {
        var objType = obj.GetType();
        if (objType == typeof(JObject))
        {
            var jObj = obj as JObject;
            if (jObj != null)
            {
                foreach (var kvp in jObj)
                {
                    var propKey = prefix + "_" + kvp.Key;
                    var valueType = kvp.Value.GetType();
                    if (typeof(JContainer).IsAssignableFrom(valueType))
                    {
                        IndexNestedObject(fields, kvp.Value, propKey);
                    }
                    else
                    {
                        fields.Add(propKey, kvp.Value.ToString().StripHtml());
                    }
                }
            }
        }
        else if (objType == typeof(JArray))
        {
            var jArr = obj as JArray;
            if (jArr != null)
            {
                for (var i = 0; i < jArr.Count; i++)
                {
                    var itm = jArr[i];
                    var propKey = prefix + "_" + i;
                    var valueType = itm.GetType();
                    if (typeof(JContainer).IsAssignableFrom(valueType))
                    {
                        IndexNestedObject(fields, itm, propKey);
                    }
                    else
                    {
                        fields.Add(propKey, itm.ToString().StripHtml());
                    }
                }
            }
        }
    }
}