Provide mapping on index creation

We were doing a silly thing where we create the index with no
mappings, and then apply the mappings in a validator. This isn't
the end of the world, but its extra cluster state updates that
we don't need making everything take a little longer.

Change-Id: I42a817e9890ca7a3a09c0c6b27019ef4c3fc0ff3
3 files changed