Thanks. But what also wasn't clear was that the MLT docs say the it uses the syntax of the Multi GET which allows for
GET /test/type/_mget
{
"ids" : ["1", "2"]
}
And it doesn't seem that's supported, or if it is, I couldn't figure out how to use it. After reading of the MLT docs again, I noticed:
The syntax to specify documents is similar to the one used by the Multi GET API.
So I don't know if that mean the short ids syntax is supported (but I don't know how to use it) or not.