non-monotonic views during rebalance

I'm able to see that views are not behaving correctly under rebalance. Specifically.

• start 4 nodes dev cluster.

• set up 1 node initially.

• create bucket default

• upload some docs (in my case via ./generate-keyset.rb -k 2000000 -v 80 | GOMAXPROCS=8 \time maxi)

• create trivial index (mapping id to null) in ui and publish it

• wait until it is built and observe on UI that first page indeed has ids from 0 to 9 (generate-keyset program produces keys in form "%08d" % [counter] )

• add 3 remainaing nodes and click rebalance

• on views UI click Show button periodically

Most of the time view results are stable (as required). I.e. I'm seeing same 0 to 9 docs on first page. However occasionally one or more rows are missing so I'm seeing doc with id 00000010.

I'm pretty sure this used to work in 2.0.