Validate: Document accessed after Locking should raise DocumentLockedException or Timeout?

class Program

 {

 static async Task Main(string[] args)

 {

 try

 {

    var cluster = await Couchbase.Cluster.ConnectAsync("couchbase://localhost",      "Administrator", "password");

    var bucket = await cluster.BucketAsync("travel-sample");

    var scope = await bucket.ScopeAsync("inventory");

    var coll = await scope.CollectionAsync("airport");

    var key = "airport-500001";

    var document = new { id=500001, type = "airport", airportname = "Francis     Airport", Country = "France" };

    await coll.UpsertAsync<dynamic>(key, document);

    await coll.GetAndLockAsync(key, TimeSpan.FromSeconds(30));

    await coll.RemoveAsync(key);

}

catch (CouchbaseException ex)

{

   Console.WriteLine(ex); 

}

catch (Exception ex)

{

    Console.WriteLine(ex); 

}

Console.Read();

}

}

Couchbase.Core.Exceptions.AmbiguousTimeoutException: The operation /25 timed out after 00:00:02.5000000. It was retried 10 times using Couchbase.Core.Retry.BestEffortRetryStrategy.

 at Couchbase.Utils.ThrowHelper.ThrowTimeoutException(IOperation operation, IErrorContext context)

 at Couchbase.Core.Retry.RetryOrchestrator.RetryAsync(BucketBase bucket, IOperation operation, CancellationTokenPair tokenPair)

 at Couchbase.KeyValue.CouchbaseCollection.RemoveAsync(String id, RemoveOptions options)

 at ScopeLevelQuery.Program.Main(String[] args) in /Users/arun.vijayraghavan/ScopeLevelQuery/ScopeLevelQuery/Program.cs:line 47