[FEATURE] AWS Personalize Plugin integration query

[sarboz]

I wanted to use aws personalize plugin to re-rank search results. In AWS documentation we see that we can achieve this through ext section in the request, But I couldn't find such an option in .net client.

 "ext": {
        "personalize_request_parameters": {
            "user_id": "USER ID"
            "context": { "DEVICE" : "mobile phone" }
        }
    }

Is there any way to use that plugin with .net client?

[dblock]

I think this is a feature request. You can always use the lower level HTTP API, https://github.com/opensearch-project/opensearch-net/blob/main/guides/json.md as a last resort, but if you have time maybe contribute these options to the higher level DSL?

[Xtansia]

This should be relatively simple to implement if we treat ext as an arbitrary dictionary field, it'd be the same as the _meta field on templates:
https://github.com/opensearch-project/opensearch-net/blob/main/src/OpenSearch.Client/Cluster/ComponentTemplate/ComponentTemplate.cs#L23-L25
https://github.com/opensearch-project/opensearch-net/blob/main/src/OpenSearch.Client/Cluster/ComponentTemplate/PutComponentTemplateRequest.cs#L20
https://github.com/opensearch-project/opensearch-net/blob/main/src/OpenSearch.Client/Cluster/ComponentTemplate/PutComponentTemplateRequest.cs#L27
https://github.com/opensearch-project/opensearch-net/blob/main/src/OpenSearch.Client/Cluster/ComponentTemplate/PutComponentTemplateRequest.cs#L31-L34

So then it'd be something like:

await client.SearchAsync(s => s
    .Ext(e => e
        .Add(
            "personalize_request_parameters",
            new
            {
                user_id = "USER_ID",
                context = new { DEVICE = "mobile phone" }
            }
        )
    )
);

[kevin-donovan-zocdoc]

We are in need of a feature like this. We can use the low level client as a workaround but we prefer to use the high level client to take advantage of the extra features in there and for the type checks.