Unable to deserialize `number` field into `TimeSpan` for inner hits

[llRandom]

NEST/Elasticsearch.Net version: 5.4.0

Elasticsearch version: 5.4.0

Description of the problem including expected versus actual behavior: Unable to deserialize number field into TimeSpan for inner hits. An attempt to deserialize inner hits into object leads to an exception: Newtonsoft.Json.JsonSerializationException: Error converting value 37230000000 to type 'System.TimeSpan'. Path 'startTime'.

Steps to reproduce:

// sample mapping with nested objects with TimeSpan field
class Root
{
    [Nested]
    public Child[] Children { get; set; }
}

class Child
{
    public TimeSpan StartTime { get; set; }

    public TimeSpan EndTime { get; set; }
}

var indexName = "sample";
var client = new ElasticClient(new ConnectionSettings().DefaultIndex(indexName));

//create index with automapping
client.CreateIndex(indexName, create => create.Mappings(mappings => mappings.Map<Root>(map => map.AutoMap())));

// add sample document
client.Index(new Root
{
    Children = new[]
    {
        new Child
        {
            StartTime = new TimeSpan(1, 2, 3),
            EndTime = new TimeSpan(2, 3, 4)
        }
    }
}, index => index.Refresh(Refresh.WaitFor));

// search with inner hits
var result = client.Search<Root>(
    search => search.Query(
        query => query.Nested(
            nested => nested.Query(
                nestedQuery => nestedQuery.MatchAll()
            ).Path(i => i.Children).InnerHits()
        )
    )
);

// try to deserialize (exception)
var children = result.Hits.First().InnerHits.Single().Value.Documents<Child>();

[russcam]

Thanks for reporting @llRandom. It's a bug, looking at a fix now