[FEATURE] sltr query

[SamuelCox]

Is your feature request related to a problem?

The sltr query does not appear to be available in the sdk, am I missing something?

var rescoreDescriptor = new RescoreDescriptor<Product>();
rescoreDescriptor.WindowSize(200).RescoreQuery(q => q.Query(rs => rs.))
rescoringDescriptor.Rescore((s) => rescoreDescriptor);            
descriptor.Rescore(s => rescoringDescriptor);

https://docs.aws.amazon.com/opensearch-service/latest/developerguide/learning-to-rank.html

What solution would you like?

var rescoreDescriptor = new RescoreDescriptor<Product>();
rescoreDescriptor.WindowSize(200).RescoreQuery(q => q.Query(rs => rs.Sltr()))
rescoringDescriptor.Rescore((s) => rescoreDescriptor);            
descriptor.Rescore(s => rescoringDescriptor);

What alternatives have you considered?

I guess we could use Raw()? I couldn't find any reference to sltr in this github so not sure if I'm missing something.

Do you have any additional context?

Add any other context or screenshots about the feature request here.

[Xtansia]

Hi @SamuelCox, You're correct that the client doesn't currently have any support for the learning-to-rank plugin. Any contributions to add support for any portions of the plugin would be greatly welcomed if you're interested in doing so.

Otherwise yes some combination of the .Raw() query or Raw HTTP methods would be the workaround.

[SamuelCox]

I'll see if I can find the time sometime, thanks