Shard Keys
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The shard key determines the distribution of the collection’s documents among a cluster’s shards.
When a shared collection has shard key different than _id or a compound shard key, the shardkey query parameter must be used.
Example: if the shard key is X
GET /db/coll/5ac9f95563445900062144aa?shardkey={"X":1} HTTP/1.1