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Re-juggle shard and replica counts in Elasticsearch
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We should have a look at our shard counts now that we have twice the number of nodes. We should also look into running four way redundancy for enwiki and maybe dewiki for speed. We originally limited ourselves to 5 shards per content index because that is what fit well into our 18 node cluster. Now that we have 31 nodes we can get away with more shards. Maybe 7 shards at four way redundancy.

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Replicas adjusted for enwiki, dewiki, commonswiki in gerrit 170182.

This is done & live.