NEST / Elastic Search Auto-Completion 'Field [suggest] is not a completion suggest field' - elasticsearch

Question

In between projects, started to play around with Elastic Search and NEST in preparation for some auto-completion features coming up.
I followed examples here and in the various docs ... and it seems like what I have should work. There must be some subtle difference with what i am doing.
This is the object that represents my document.
[ElasticType(IdProperty="KeyInstn")]
public class Instn
{
[ElasticProperty(Name = "keyinstn", Index = FieldIndexOption.Analyzed, Type = FieldType.Integer)]
public int KeyInstn { get; set; }
public string Type { get; set; }
[ElasticProperty(Name = "name", Index = FieldIndexOption.Analyzed, Type = FieldType.String)]
public string Name { get; set; }
[ElasticProperty(Name = "ticker", Index = FieldIndexOption.Analyzed, Type = FieldType.String)]
public string Ticker { get; set; }
[ElasticProperty(Name = "street", Index = FieldIndexOption.Analyzed, Type = FieldType.String)]
public string Street { get; set; }
[ElasticProperty(Name = "city", Index = FieldIndexOption.Analyzed, Type = FieldType.String)]
public string City { get; set; }
[ElasticProperty(Name = "state", Index = FieldIndexOption.Analyzed, Type = FieldType.String)]
public string State { get; set; }
[ElasticProperty(Name = "zip", Index = FieldIndexOption.Analyzed, Type = FieldType.String)]
public string Zip { get; set; }
[ElasticProperty(Name = "country", Index = FieldIndexOption.Analyzed, Type = FieldType.String)]
public string Country { get; set; }
[ElasticProperty(Name = "suggest", Type = FieldType.Completion)]
public CompletionField Suggest { get; set; }
}
This is the code that I use to create my index:
var index = client.CreateIndex("snl", c => c
.NumberOfReplicas(1)
.NumberOfShards(5)
.Settings(s => s
.Add("merge.policy.merge_factor", "10")
.Add("search.slowlog.threshold.fetch.warn", "1s")
)
.AddMapping<Instn>(m => m.MapFromAttributes()
.Properties(props => props
.Completion(s => s
.Name(p => p.Suggest)
.IndexAnalyzer("simple")
.SearchAnalyzer("simple")
.MaxInputLength(20)
.Payloads()
.PreservePositionIncrements()
.PreserveSeparators()
)
)
));
I am populating my documents using IndexMany in batches of 1000 documents.
I then perform my query:
var suggestResponse = this._client.Suggest<Instn>(s => s
.Index("snl")
.Completion("suggest", c => c
.Text(this.AutoCompleteText.Text)
.OnField("suggest")));
The error I receive is:
Field [suggest] is not a completion suggest field
Using SENSE, I pulls the mappings and notice that "suggest" doesn't have a type. The examples I followed indicate that the type should be 'completion.:'
Elasticsearch - Autocomplete with NEST
{
"snl": {
"mappings": {
"instn": {
"properties": {
"city": {
"type": "string"
},
"country": {
"type": "string"
},
"keyinstn": {
"type": "long"
},
"name": {
"type": "string"
},
"state": {
"type": "string"
},
"suggest": {
"properties": {
"input": {
"type": "string"
},
"output": {
"type": "string"
},
"payload": {
"type": "long"
},
"weight": {
"type": "double"
}
}
},
"type": {
"type": "string"
},
"zip": {
"type": "string"
}
}
}
}
}
}
In place of the CompletionObject I created myself, I also tried the intrinsic object, "SuggestField."
If anyone could point me in the right direction of what I am doing wrong, I'd appreciate it. FWIW "normal" searches work fine and return appropriate results.
Thanks.
UPDATE 1/26/2016
So, managed to get an index created that looks "better" ... I was able to get around the new error "analyzer on completion field must be set when search_analyzer is set" by omitting the search analyzer during creation and now my index looks like this:
{
"snl": {
"aliases": {},
"mappings": {
"instn": {
"properties": {
"city": {
"type": "string"
},
"country": {
"type": "string"
},
"keyinstn": {
"type": "long"
},
"name": {
"type": "string"
},
"state": {
"type": "string"
},
"suggest": {
"properties": {
"completion": {
"properties": {
"field": {
"type": "string"
}
}
},
"input": {
"type": "string"
},
"output": {
"type": "string"
},
"payload": {
"type": "long"
},
"text": {
"type": "string"
},
"weight": {
"type": "double"
}
}
},
"type": {
"type": "string"
},
"zip": {
"type": "string"
}
}
}
},
"settings": {
"index": {
"creation_date": "1453835225862",
"number_of_shards": "5",
"number_of_replicas": "1",
"uuid": "90QKK1OyRMKtwcyjAwPElA",
"version": {
"created": "2010199"
}
}
},
"warmers": {}
}
}
However, no completion searches return any results. Is it because the search analyzer omission? If so, how do I get around the "analyzer on completion field must be set when search_analyzer is set" error?