Hi,

So I hit the same issue and resolved it by adding an examine indexer that added a custom field for the UDI

 protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        ExamineManager.Instance.IndexProviderCollection["NewsIndexer"]
            .GatheringNodeData += OnGatheringNodeData;

    }

    private void OnGatheringNodeData(object sender, IndexingNodeDataEventArgs e)
    {
        var node = new Node(e.NodeId);

        e.Fields.Add(CmsConstants.ExamineConstants.CATEGORY_FILTER, BuildFilter(node, "categories"));

    }
    public string BuildFilter(Node node, string property)
    {

            var values = node.Properties[property].ToString();
            var ids = new StringBuilder();

            foreach (var id in values.Split(','))
            {
                if (ids.Length > 0)
                {
                    ids.Append(" ");
                }

                ids.Append(id.Replace("umb://document/", ""));
            }

            return ids.ToString();

    }

Then when searching the index by the document, where I had the primary key of the document and not the UDI I used the umbraco helper to get the page by id, something like this (_umbracoHelper is of type UmbracoHelper):

var page = _umbracoHelper.TypedContent(pageId);

Then the value to use in examine search becomes:

page.GetKey().ToString().Replace("-","");

I have the same issue and posted another forum question on this. I looks like the umb syntax (containing a colon (:) causes a lucene syntax error because the colon is used as the key/value separator in the raw query.

In my case, I am searching a members index set and searching against a value of a content picker. That content picker is returning a umb string as I can see it when I search all by removing the search criteria.

In the end, I had to build a raw query and then add wildcards before the key value and change my search value from a umb to a guid where I stripped out the "-" characters.

Here is my code for this:

var searcher = ExamineManager.Instance.SearchProviderCollection["ExternalMemberSearcher"];
var criteria = searcher.CreateSearchCriteria();

var contentTypeFilter = string.Format("__IndexType:{0}", UmbracoExamine.IndexTypes.Member);
var searchKey = "advisor";
//var searchValue = Udi.Create(Constants.UdiEntityType.Document, currentAdvisor.GetKey()).ToString(); // This does not work as the umb colon causes a lucene sytax error
var searchValue = currentAdvisor.GetKey().ToString().Replace("-","");

var query = new StringBuilder();
query.AppendFormat("+{0} ", contentTypeFilter);
query.AppendFormat("+({0}:*{1}*)", searchKey, searchValue);
var searchResults = searcher.Search(criteria.RawQuery(query.ToString()));

Also, importantly you need to addenableLeadingWildcard="true" to your searcher config in examineSettings.config. I understand this is not performant, but what to do...

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