in elasticsearch/src/root/bulk.rs [197:209]
fn write(&self, bytes: &mut BytesMut) -> Result<(), Error> {
let writer = bytes.writer();
serde_json::to_writer(writer, &self.header)?;
bytes.put_u8(b'\n');
if let Some(source) = &self.source {
let writer = bytes.writer();
serde_json::to_writer(writer, source)?;
bytes.put_u8(b'\n');
}
Ok(())
}