SOLVED: attach a file using REST from scriptrunner

I have created a very simple test script to figure out how to attach a file to an issue. The "file" is actually just text that I want to create a file. Since this is in the Cloud, I am assuming that I can't write the file to a temp file in order to import it.

import org.apache.http.entity.ContentType;
String text = "This is a simple set of text"


def response = Unirest.post("/rest/api/3/issue/CDFT-1/attachments")
.header("Accept", "application/json")
.header("Content-Type", "text/plain")
.header("X-Atlassian-Token", "no-check")
.field("file", text.getBytes(), "text.txt")
.asJson();

I get a 415 - Unsupported Media Type error from this. Any help is welcome