remove_binary Option ElasticsearchClient

Question

The official docs for Elasticsearch state that there is a remove_binary option you can define when setting up an attachment ingestion pipeline: https://www.elastic.co/guide/en/elasticsearch/reference/8.10/attachment.html

I am using the official C# client and ES8:

// client creation/connection removed

// Define the ingest pipeline
var ingestPipelineResult = await client.Ingest.PutPipelineAsync("attachment", p => 
    p.Processors(x =>
    {
        x.Attachment<Document>(a =>
        {
            a.Field(f => f.Data);
            a.IndexedChars(-1);
            a.RemoveBinary(true); // this is what I want; not a real thing
        });
    }));

And for the sake of completeness, the Document class:

public class Document
{
    public string Id { get; set; }
    public string Title { get; set; }
    public string Data { get; set; } //Base64 encoded
    public string Description { get; set; }
}

As mentioned in the comment, the RemoveBinary method isn't real, so my question is whether it's possible to set this via the ElasticsearchClient. If so, how? A couple of (clunky) work arounds exist: a) I can re-put the document after removing the data property, b) I can create an authenticated HttpClient and post directly against the API. Neither of these are desirable, so any help would be appreciated.