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When sharding a collection with a hashed shard key but including invalid options will output the following error:
mongos> sh.shardCollection("test.foo", {_id:"hashed"}, {pieinthesky:1})
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{
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"ok" : 0,
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"errmsg" : "Hashed shard keys cannot be declared unique. It's possible to ensure uniqueness on the hashed field by declaring an additional (non-hashed) unique index on the field.",
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"code" : 72,
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"codeName" : "InvalidOptions",
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"operationTime" : Timestamp(1541185291, 4),
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"$clusterTime" : {
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"clusterTime" : Timestamp(1541185291, 4),
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"signature" : {
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"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
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"keyId" : NumberLong(0)
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}
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}
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}
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The problem is my invalid option, not the hashed shard key.
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