What about adding one new leader/replica pair?  It seems that would entail

a) creating the r3.large instances and volumes
b) adding 2 new Zookeeper hosts?
c) updating my Zookeeper configs (new hosts, new ids, new SOLR config)
d) restarting all ZKs
e) restarting SOLR hosts in sequence needed for correct shard/replica
assignment
f)  start indexing again

So shards 1,2,3 start with 33% of the docs each.  As I start indexing new
documents get sharded at 25% per shard.  If I reindex a document that exists
already in shard2, does it remain in shard2 or could it migrate to another
shard, thus removing it from shard2.

I'm looking for a migration strategy to achieve 25% docs per shard.  I would
also consider deleting docs by daterange from shards1,2,3 and reindexing
them to redistribute evenly.




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