Transaction not yet indexed

ML28aMMysDVF4VmU3Q2PQBAMYKUgGRTRaiVhmSXbJy7ud6wd6Me17nqi4c2nc7JEzqLK4D9YGdrAA33DNn8YTCt

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.