xConnect upgrade issues (upgrade from Sitecore 9.0.1 to 9.0.2)

Question

I am trying to upgrade a solution from Sitecore 9.0.1 to Sitecore 9.0.2 The upgrade package went well, followed the procedure upgraded xConnect as well.

When trying to work with list manager - do not see any of my contacts.

In sitecore log there is exception

11896 13:39:53 ERROR [ListManagement]: Failed to get count of contacts for 60287a84-243b-4946-a51c-31366baf3842 contact list. The error has been occurred: The HTTP response was not successful: InternalServerError
Exception: Sitecore.XConnect.XdbSearchUnavailableException
Message: The HTTP response was not successful: InternalServerError
Source: Sitecore.Xdb.Common.Web
   at Sitecore.Xdb.Common.Web.Synchronous.SynchronousExtensions.SuspendContextLock[TResult](Func`1 taskFactory)
   at Sitecore.XConnect.Client.XConnectSynchronousExtensions.SuspendContextLock[TResult](Func`1 taskFactory)
   at Sitecore.XConnect.Client.XConnectSynchronousExtensions.GetBatchEnumeratorSync[TEntity](IAsyncQueryable`1 asyncQueryable, Int32 defaultBatchSize)
   at Sitecore.XConnect.Segmentation.SegmentationEngine.c.b__24_0(IAsyncQueryable`1 contacts)
   at Sitecore.XConnect.Segmentation.SegmentationEngine.PerformSearch[T](IContactSearchQueryFactory queryFactory, Func`2 searchWork, Byte[] syncToken, ContactExpandOptions expandOptions)
   at Sitecore.XConnect.Segmentation.SegmentationEngine.CountContacts(IContactSearchQueryFactory queryFactory)
   at Sitecore.ListManagement.Services.Repositories.ListRepositoryBase`1.c__DisplayClass51_0.b__0()

14112 13:39:53 ERROR [ListManagement]: Failed to get count of contacts for 88184756-e227-4d0c-b816-ee71ab4c843f contact list. The error has been occurred: The HTTP response was not successful: InternalServerError

And in xConnect logs I see next:

2018-07-13 14:43:20.437 +02:00 [Error] Sitecore.XConnect.Operations.XdbSearchOperation`1[Sitecore.XConnect.Contact]: System.InvalidOperationException: Cursor functionality requires a sort containing a uniqueKey field tie breaker
   at Sitecore.Xdb.Collection.Search.Solr.SolrResults.JsonResultsParser.MoveReaderToResponse(JsonTextReader reader)
   at Sitecore.Xdb.Collection.Search.Solr.SolrResults.JsonResultsParser.ParseSearchResponse[TSolrResult](JsonTextReader reader)
   at Sitecore.Xdb.Collection.Search.Solr.SolrResults.JsonResultsParser.d__3`1.MoveNext()

Any ideas what is missing?

I did update all solr cores with uniqueId field change as described in the upgrade guide.

Answer 1

I figured out that xdb and xdb_rebuild cores should not be updated with manages schema uniqueId fields. However the upgrade guilde says all cores should be updated. So resolution was rolling back managed schemas for xdb SOLR cores.