Well the text says elder, not clergy.  And it says, they (Paul and Barnabas), it doesn't say anything about the Holy Spirit. It sounds a lot like an Adventist Ordination.  I'm not thinking ordained, I'm 'reading' ordained.  The bible doesn't say more or less.  I don't think you can say, as you have said, "ordination is not biblical." 

I have always thought Adventists had a very flat ecclesiology, Elders and Deacons.  Some Elders are ordained to the gospel ministry; and that is it.  All modeled on the New Testament, we not copying holy orders from the Roman Catholic church.