NEST Returns Nothing on Fuzzy Search - elasticsearch

Question

I use the following query in Sense and I get some results back:
POST myindex/mytype/_search
{
"query": {
"fuzzy_like_this_field" : {
"BookLabel" : {
"like_text" : "myBook",
"max_query_terms" : 12
}
}
}
}
But with the following code using Nest I get nothing:
var docs = client.Search<dynamic>(b => b
.Index("myindex")
.Type("mytype")
.Query(q => q
.Fuzzy(fz => fz
.OnField("BookLabel")
.Value("myBook")
)
)
).Documents.ToList();
I can't see the difference between them. What am I missing?

Answer 1

You NEST query you have above produces the following query DSL
{
"query": {
"fuzzy": {
"BookLabel": {
"value": "myBook"
}
}
}
}
To get the nearest equivalent to a fuzzy_like_this_field query (which is deprecated in Elasticsearch 1.6.0 and will be removed in 2.0), you can run a fuzzy_like_this query only on the field you're interested in
void Main()
{
var settings = new ConnectionSettings(new Uri("http://localhost:9200"));
var connection = new InMemoryConnection(settings);
var client = new ElasticClient(connection: connection);
var docs = client.Search<dynamic>(b => b
.Index("myindex")
.Type("mytype")
.Query(q => q
.FuzzyLikeThis(fz => fz
.LikeText("myBook")
.MaxQueryTerms(12)
.OnFields(new [] { "BookLabel" })
)
)
);
Console.WriteLine(Encoding.UTF8.GetString(docs.RequestInformation.Request));
}
This outputs the following query DSL
{
"query": {
"flt": {
"fields": [
"BookLabel"
],
"like_text": "myBook",
"max_query_terms": 12
}
}
}
which should yield the same results as you see in Sense.