Hey Damo,

Because we hook into the DocumentWriting event on app startup we need to know of the indexes at this point, so we can ensure the fields are indexed properly for faceting. So currently it wouldn't be possible to switch out the index provider in your controller.

I think the only way would be to have multiple browsers for each of your indexes.

Cheers, Tom

Did this in the end:

private void BrowserIndexer_DocumentWriting(IEnumerable<IFacetField> facetFields, object sender, DocumentWritingEventArgs e, UmbracoHelper helper)
    {
        var contentTypeService = ApplicationContext.Current.Services.ContentTypeService;

        IContentType contentType = contentTypeService.GetContentType(e.Fields["nodeTypeAlias"]);
        IEnumerable propertyTypes = contentType.CompositionPropertyTypes;

        foreach (var facetField in facetFields)
        {
            if (e.Fields.ContainsKey(facetField.Alias))
            {
                var facetValue = e.Fields[facetField.Alias];

                foreach (PropertyType propertyType in propertyTypes)
                {
                    if (propertyType.Alias == facetField.Alias && propertyType.PropertyEditorAlias == "Umbraco.MultiNodeTreePicker2")
                    {
                        foreach (var value in facetField.PrepareForIndex(facetValue))
                        {
                            Udi udi;

                            if (Udi.TryParse(value, out udi))
                            {
                                e.Document.Add(facetField.CreateIndexField(helper.TypedContent(udi).Name));
                            }
                        }

                    }
                    else if (propertyType.Alias == facetField.Alias)
                    {
                        foreach (var value in facetField.PrepareForIndex(facetValue))
                        {
                            e.Document.Add(facetField.CreateIndexField(value));
                        }
                    }
                }

            }
        }
    }

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