Should + Must combination query using NEST client for elastic - elasticsearch

Question

I have a requirement to get data based on combination of properties with OR and AND combination and i am not able to get this query done. Help me with what it should be like in json and also using NEST client.
SQL query:
Select *
From MySourceTable
Where (flag1 In ("Y","N")
And EntityStatus In ("STAT1", "STAT2")
And EntityType In ("T3"))
Or (flag1 In ("N") And EntityType In ("T1", "T2"))
So far my query builds all must queries which resulted in fewer or none results. So theoretically I believe each query is MUST queries and all must queries have to be merged using OR.
Help me build json

Answer 1

You are on a good way, the query will look something like
var searchResponse = await elasticClient.SearchAsync<EsDocument>(s => s
.Query(q =>
(
q.Terms(t => t.Field(f => f.Flag1.Suffix("keyword")).Terms("Y", "N")) &&
q.Terms(t => t.Field(f => f.EntityStatus.Suffix("keyword")).Terms("STAT1", "STAT2")) &&
q.Terms(t => t.Field(f => f.EntityType.Suffix("keyword")).Terms("T3"))
) ||
(
q.Terms(t => t.Field(f => f.Flag1.Suffix("keyword")).Terms("N")) &&
q.Terms(t => t.Field(f => f.EntityType.Suffix("keyword")).Terms("T1", "T2"))
)));
You didn't share your index mapping and query, so hard to say why your query didn't work.
UPDATE
You can compose such query dynamically using the following
var should = new QueryContainer();
should |=
(
new TermsQuery { Field = Infer.Field<EsDocument>(f => f.Flag1.Suffix("keyword")), Terms = new []{ "Y", "N" }} &&
new TermsQuery { Field = Infer.Field<EsDocument>(f => f.EntityStatus.Suffix("keyword")), Terms = new []{ "STAT1", "STAT2" }} &&
new TermsQuery { Field = Infer.Field<EsDocument>(f => f.EntityType.Suffix("keyword")), Terms = new []{ "T3" }}
);
should |=
(
new TermsQuery { Field = Infer.Field<EsDocument>(f => f.Flag1.Suffix("keyword")), Terms = new []{ "N" }} &&
new TermsQuery { Field = Infer.Field<EsDocument>(f => f.EntityType.Suffix("keyword")), Terms = new []{ "T1", "T2" }}
);
var searchResponse = await elasticClient.SearchAsync<EsDocument>(s => s
.Query(q => should));