[FEATURE] Support bool query operators in Query DSL

Elastic.Clients.Elasticsearch version:

8.0.0-beta.1

Elasticsearch version:

8.3.2

.NET runtime version:

6.0.300

Operating system version:

NixOS 22.05

Description of the problem including expected versus actual behavior:

The operators described on this page appear to be missing.
https://www.elastic.co/guide/en/elasticsearch/client/net-api/current/bool-queries.html

Expected behavior

I expected them to be provided, eventually. Unless for some reason they are no longer intended to be supported?

[stevejgordon]

Hi @sjg-ep. Operators for combining queries are currently a missing feature. The intention is to re-introduce these during the beta phase.

[jonyadamit]

Has this been added yet? Is there an estimation for it's availability?

[lanwin]

I am also wonder when this will be available. We relay heavily on them and can not upgrade without it.

[svenhartmann]

Same issues here.

I'm also confused because a TermsQuery for example inherits from SearchQuery but the property Must of the BoolQuery expects an object of type Query.

Are there examples of how I can use multiple TermsQuery within Must/Should/... of a BoolQuery with the new client?

What is the proper way to convert a SearchQuery to a Query?

[stevejgordon]

@svenhartmann The various query types have implicit conversion operators to Query, a container type. This test includes a basic example of building bool queries with either the object initializer or fluent syntax.

[stevejgordon]

I don't have an ETA I can share for when this feature will be reintroduced.

[svenhartmann]

@stevejgordon Thanks for the fast anwser! I didn´t realized cast at static implicit operator Query(TermsQuery termsQuery). So it should be safe to use casting at array or list level e.g. aListOfTermsQuery.Cast<Query>().ToArray() , correct?

[stevejgordon]

@svenhartmann No, you won't be able to the IEnumerable.Cast approach. Due to how that's implemented, it won't work with user-defined operators. Can you not type your original List to List<Query>? If not, you may need to Select and cast the elements manually.

var queries = new List<Query> { new TermQuery("a-field") { Value = "a-value" }, new TermQuery("a-field") { Value = "b-value" } };

[svenhartmann]

@stevejgordon Thanks for the hint. Did it like

var terms = filters
.Select(x =>
{
    return Query.Terms(new TermsQuery
    {
        Field = "myField", Terms = new TermsQueryField(x.Values.Select(FieldValue.String).ToArray())
    });
})
.ToArray();

and then created a simple BoolQuery with a Must clause. Works fine :)

With the NEST Client i used a list of terms queries and Enumerable.Aggregate to create the BoolQuery e.g. var boolQuery = terms.Aggregate(queryContainer, (current, item) => current & item);

[stevejgordon]

I've broken this issue into two units of work which we will address separately. I'll close out this issue as we'll track progress in the new issues.