xConnect Contact Identifier Search

Question

I'm trying to write some xConnect search functionality that will search through all identifiers of all contacts.

SOLR is running and I have added a set of sample contacts using the xConnect API.

This code executes as expected and finds a contact based on a twitter source:

using (var client = new XConnectClient(config))
{    
    var reference = new IdentifiedContactReference("twitter", "Twitter1");

    Task<Contact> contactTask = client.GetAsync<Contact>(reference, new ContactExpandOptions() { });

    Contact contact = await contactTask;
}

However code below doesn't return any contacts (and I would expect it to based on the above):

using (var client = new XConnectClient(config))
{    
    var queryable = client.Contacts.Where(x => x.Identifiers.Any(y => y.Identifier == "Twitter1")).GetBatchEnumerator(10);

    var enumerator = await queryable;

    while (await enumerator.MoveNext())
    {
        if (enumerator.Current != null)
        {
            foreach (var contact in enumerator.Current)
            {
                // process each contact
            }
        }
    }
}

This code is an attempt to match the string "Twitter1" to any identifier source, not just a twitter source. If anyone knows what I might be doing wrong or another way of approaching this I'd be very grateful for some advice.

Answer 1

Contact Identifiers are considered PII sensitive and are not indexed by default. To enable indexing of PII sensitive data, set IndexPIISensitiveData to true for xConnect index worker which is typically installed under xConnect website. Configuration file to update: App_data\jobs\continuous\IndexWorker\App_data\Config\Sitecore\sc.Xdb.Collection.IndexerSettings.xml or patch the setting by creating a patch file.

Also see the note about identifiers in the official documentation.

As Peter Prochazka wrote in the comment - be aware of GDPR requirements when indexing PII sensitive data, i.e. get user consent before storing any PII data. In case you need more context about GDPR in Sitecore 9, this document might be a good start.