NEST 5.3 Exception

Elasticsearch.Net.UnexpectedElasticsearchClientException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Elasticsearch.Net.DynamicResponse.Create(IDictionary`2 values) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Elasticsearch.Net\Responses\DynamicResponse.cs:line 38
   at Nest.ConcreteTypeConverter.GetConcreteTypeUsingSelector[T](JsonSerializer serializer, ConcreteTypeConverter`1 realConcreteConverter, JObject jObject) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\CommonAbstractions\SerializationBehavior\StatefulDeserialization\ConcreteTypeConverter.cs:line 150
   at Nest.ConcreteTypeConverter.GetUsingConcreteTypeConverter[T](JsonReader reader, JsonSerializer serializer, ConcreteTypeConverter`1 realConcreteConverter) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\CommonAbstractions\SerializationBehavior\StatefulDeserialization\ConcreteTypeConverter.cs:line 85
   at Nest.DefaultHitJsonConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\CommonAbstractions\SerializationBehavior\StatefulDeserialization\ConcreteTypeConverter.cs:line 26
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IList list, JsonReader reader, JsonArrayContract contract, JsonProperty containerProperty, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize[T](JsonReader reader)
   at Nest.JsonNetSerializer.Deserialize[T](Stream stream) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\CommonAbstractions\SerializationBehavior\JsonNetSerializer.cs:line 124
   at Nest.ElasticClient.FieldsSearchDeserializer[T,TResult,TRequest,TRequestParameters](IApiCallDetails response, Stream stream, TRequest d) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\Search\Search\ElasticClient-ResponseCovariance.cs:line 36
   at Nest.ElasticClient.<>c__DisplayClass551_0`4.<CreateSearchDeserializer>b__0(IApiCallDetails r, Stream s) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\Search\Search\ElasticClient-ResponseCovariance.cs:line 28
   at Elasticsearch.Net.ResponseBuilder`1.SetBody(ElasticsearchResponse`1 response, Stream stream) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Elasticsearch.Net\Transport\Pipeline\ResponseBuilder.cs:line 83
   at Elasticsearch.Net.ResponseBuilder`1.ToResponse() in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Elasticsearch.Net\Transport\Pipeline\ResponseBuilder.cs:line 40
   at Elasticsearch.Net.HttpConnection.Request[TReturn](RequestData requestData) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Elasticsearch.Net\Connection\HttpConnection.cs:line 176
   at Elasticsearch.Net.RequestPipeline.CallElasticsearch[TReturn](RequestData requestData) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Elasticsearch.Net\Transport\Pipeline\RequestPipeline.cs:line 431
   at Elasticsearch.Net.Transport`1.Request[TReturn](HttpMethod method, String path, PostData`1 data, IRequestParameters requestParameters) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Elasticsearch.Net\Transport\Transport.cs:line 69
   --- End of inner exception stack trace ---
   at Elasticsearch.Net.Transport`1.Request[TReturn](HttpMethod method, String path, PostData`1 data, IRequestParameters requestParameters) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Elasticsearch.Net\Transport\Transport.cs:line 89
   at Nest.LowLevelDispatch.SearchDispatch[T](IRequest`1 p, PostData`1 body) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\_Generated\_LowLevelDispatch.generated.cs:line 2769
   at Nest.ElasticClient.Nest.IHighLevelToLowLevelDispatcher.Dispatch[TRequest,TQueryString,TResponse](TRequest request, Func`3 responseGenerator, Func`3 dispatch) in C:\Users\russc\source\git\elasticsearch-net-5.x\src\Nest\ElasticClient.cs:line 57