Push Cirrus' non-content enwiki shards apart

These are large shards and when many of them assign to the same node it
causes the cluster to be unbalanced.

DEPLOYMENT:  This just makes permanent something that has already been
applied directly to Elasticsearch.

Change-Id: I4cf255715b0d4efe1ef8d5dda4118f6011143857
Merge "Push Cirrus' non-content enwiki shards apart"