Lee Hinman 145374b762 Add cluster-wide setting for total shard limit
This adds the `cluster.routing.allocation.total_shards_per_node`
setting, which limits the total number of shards across all indices on
each node. It defaults to -1 and can be dynamically configured.

Resolves #14456
2015-11-09 11:03:07 -07:00
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