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Assigned Teams:

Query
Operating System:
ALL
Steps To Reproduce:
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> use qa switched to db qa > db.test.ensureIndex({ts:"hashed"}, {hashVersion:1}) > db.test.insert({ts:ISODate()}) Only HashVersion 0 has been defined > db.dropDatabase() { "dropped" : "qa", "ok" : 1 }

Expected behavior:

> use qa switched to db qa > db.test.insert({ts:ISODate()}) > db.test.ensureIndex({ts:"hashed"}, {hashVersion:1}) { "err" : "Only HashVersion 0 has been defined", "code" : 16245, "n" : 0, "connectionId" : 5, "ok" : 1 }
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> use qa switched to db qa > db.test.ensureIndex({ts: "hashed" }, {hashVersion:1}) > db.test.insert({ts:ISODate()}) Only HashVersion 0 has been defined > db.dropDatabase() { "dropped" : "qa" , "ok" : 1 } Expected behavior: > use qa switched to db qa > db.test.insert({ts:ISODate()}) > db.test.ensureIndex({ts: "hashed" }, {hashVersion:1}) { "err" : "Only HashVersion 0 has been defined" , "code" : 16245, "n" : 0, "connectionId" : 5, "ok" : 1 }

ensureIndex does not enforce constraints such as hashVersion can only be 0 until data exists in collection.