We Keep Coding

Exclude nulls in Nest Api query

I have added the following snippet in a nest query which returns a ISearchResponse<T>
.Query(query => query.Match(m =>
m.Field(f =>
f => !string.IsNullOrEmpty(f.Purchase.NationalCode.Trim()))
)))
But it makes no difference to the amount of records returned (and I know there are nulls in there)
Should I do be building my query some other way?
Edited to add:
I've tried the following based on this answer here but no luck either
.Query(query => query.Bool(b=>
b.Must(m=> m.Exists(
f=>f.Field("nationalCode")))))
.Query(query => query.Bool(b=>
b.MustNot(m=> m.Term(
"nationalCode", ""))))

Try the following
.Query(query => query
.Bool(b => b
.Must(m => m
.Exists(f => f.Field("nationalCode"))
)
.MustNot(m => m
.Term("nationalCode", "")
)
)
)
Both the .Must and .MustNot need to be called on the same bool query descriptor

Elasticsearch / Nest search using MultiMatch with default boosting for all other fields

I'm trying to build a query that basically searches over all full text fields, boosting a few, but leaving all others at the default boost of 1.
When I don't include any fields, everything has a boost of 1 (we're on version 6.4.2 which supports default when no fields are specified):
var results = await _ElasticClient.SearchAsync<dynamic>(s => s
.Query(q => q
.MultiMatch(m => m
.Query(request.Query)
)
)
);
However, as soon as I try to boost a single field, it removes the defaults on all the other fields, only searching on the explicit field:
var results = await _ElasticClient.SearchAsync<dynamic>(s => s
.Query(q => q
.MultiMatch(m => m
.Fields(f => f.Field("firstName^20"))
.Query(request.Query)
)
)
);
I tried adding a wildcard, but this still just matches on firstName (then again, the wildcard on its own doesn't match anything, so assuming I have the syntax wrong on that):
var results = await _ElasticClient.SearchAsync<dynamic>(s => s
.Query(q => q
.MultiMatch(m => m
.Fields(f => f.Field("*.*^1"))
.Fields(f => f.Field("firstName^20"))
.Query(request.Query)
)
)
);
I also tried Booling them together, but this also just matches on firstName:
var results = await _ElasticClient.SearchAsync<dynamic>(s => s
.Query(q => q
.Bool(b => b
.Should(m => m
.MultiMatch(mm => mm
.Query(request.Query)
)
)
.Should(m => m
.MultiMatch(mm => mm
.Fields(f => f.Field("firstName^20"))
.Query(request.Query)
)
)
)
)
);
I'm starting to think this isn't possible. For context, the reason I'm trying to do this is to be able to add other full text fields to the index without having to include every field in our queries, but still be able to boost certain fields.

Figured out my problem. I was chaining multiple .Fields() (plural) together, where I should only have a single .Fields() (plural) and then chain multiple .Field() (singular) together:
var results = await _ElasticClient.SearchAsync<dynamic>(s => s
.Query(q => q
.MultiMatch(m => m
.Fields(f => f
.Field("firstName^20")
.Field("*.*^1")
)
.Query(request.Query)
)
)
);

How to get synonyms working in elastic search through C#?

For the last few hours I've been trying to get the synonyms working in Elastic Search but so far failed.
When I do the search it's like the synonyms never get indexed.
Below is the part of code where I think I may be making a mistake.
Please have a look and any help will be much appreciated.
var createIndexTask = Client.CreateIndexAsync(synonymsindexname, i => i
.Settings(s => s
.Analysis(a => a
.TokenFilters(tf => tf
.Synonym("my_synonym", sf => sf
.Format(SynonymFormat.Solr)
.SynonymsPath("synonyms/solrsynonyms.txt")
)
)
.Analyzers(an => an
.Custom("my_analyzer", ca => ca
.Tokenizer("standard")
.Filters("lowercase", "stop", "my_synonym")
)
)
)
)
.Mappings(m => m
.Map<ClinicalCode>(c => c
.AutoMap()
.Properties(p => p
.Completion(comp => comp
.Contexts(ctx => ctx
.Category(csug => csug
.Name("ShortDescription")
.Path(x => x.ShortDescription)
)
)
.Name(n => n.Suggests)
.Analyzer("simple")
)
.Text(t => t
.Name(n => n.LongDescription)
.Analyzer("my_analyzer")
.CopyTo(ct => ct
.Field("allFields")
)
)
.Text(t => t
.Name(n => n.ShortDescription)
.Analyzer("my_analyzer")
.CopyTo(ct => ct
.Field("allFields")
)
)
.Text(t => t
.Name(n => n.ICDCode)
.Analyzer("my_analyzer")
.CopyTo(ct => ct
.Field("allFields")
)
)
.Keyword(k => k
.Name(n => n.ICDCode)
)
)
)
)
);

Dynamic Query in Elastic NEST

So I have manually built the following Query in NEST which works correctly,
What im trying to figure out is a way to build this dynamically dependent on what Product Specification Filters are passed in
.Query(q => q
.MultiMatch(m => m
.Query(searchBox.Text + "*")
.Fields(ff => ff
.Field(f => f.Name, boost: nameBoost)
.Field(f => f.Description, boost: descriptionBoost)
.Field(f => f.ProductCode)))
&& q.Nested(n => n
.Path(p => p.ProductSpecification)
.Query(q2 => q2
.Terms(t => t
.Field(f => f.ProductSpecification.Suffix("name"))
.Terms("Guarantee")
)).Query(q3 => q3
.Terms(t2 => t2
.Field(f2 => f2.ProductSpecification.Suffix("value"))
.Terms("3 years")
)))
&& q.Nested(n => n
.Path(p => p.ProductSpecification)
.Query(q2 => q2
.Terms(t => t
.Field(f => f.ProductSpecification.Suffix("name"))
.Terms("Brand")
)).Query(q3 => q3
.Terms(t2 => t2
.Field(f2 => f2.ProductSpecification.Suffix("value"))
.Terms("Sony")
)))
After looking at the link that Russ has shared I think the solution is to pass in my filters
public class ElasticJsonFilter
{
public string name { get; set; }
public List<string> Values { get; set; } = new List<string>();
}
Which will give me names such as "Guarantee" and values such as "2 Years, 3 Years" looking at the code that Russ linked I can get his to run through my list of filters and spit out boolean filters but I guess I need to get this to build a nested query?
elasticParams.Filters.Aggregate(new QueryContainer(), (c, s) => c && +q.Term(p => p.Name, s), c => c);

Elastic Nest Adding Meta to Aggregations

I am successfully creating Aggregations with my Elastic NEST query but I would like to pass some additional information in I have seen that I can use Meta for this, but I cannot find any documentation for doing it in NEST.
HERE is my nest Aggregations code
.Aggregations(aa => aa.Terms("groups", sp => sp.Field(p => p.ProductSpecification.Suffix("name"))
.Aggregations(aaa => aaa
.Terms("attribute", tt => tt.Field(ff => ff.ProductSpecification.Suffix("value"))))
Basically id like to be add say SpecificationId to the meta any hints?

You can add meta per aggregation, and it'll be returned on the aggregation response
var response = client.Search<User>(s => s
.Size(0)
.Query(q => +q
.Term(m => m
.Field(f => f.Badges.First().Name)
.Value("c#")
)
)
.Aggregations(a => a
.SignificantTerms("badges", st => st
.Field(f => f.Badges.First().Name)
.Meta(m => m
.Add("meta_1", "value_1")
.Add("meta_2", 2)
)
)
)
);