Filter source fields by a document source

[anti-social]

Having following document and its doc source:

object UserDoc : Document() {
    val id by long()
    val name by string()

    override val dynamicTemplates : DynamicTemplates() {
        val ids by template(
            mapping = long(index = false).subFields(::IdSubFields),
            match = "*_id",
        )
    )
}

class UserDocSource : DocSource() {
    val id by UserDoc.id
    val name by UserDoc.name
    val ids by UserDoc.dynamicTemplates.ids
}

We should be able to filter source fields in a search query:

SearchQuery().source(UserDocSource())