Document source with dynamic fields

[anti-social]

Consider following document:

object UserDoc : Document() {
    override val dynamicTemplates : DynamicTemplates() {
        val ids by template(
            mapping = long(index = false).subFields(::IdSubFields),
            match = "*_id",
        )
        val strings by template(
            mapping = Mapping(
                docValues = false,
            ),
            matchMappingType = MatchMappingType.STRING,
        )
    }
}

We want *_id fields to be mapped in document source class.

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

So then we could write:

val companyId: Long = user.ids["company_id"]
val comment: String = user.strings["comment"]