Running mongodump then mongorestore should restore the _id index with its exact original spec

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    • Platforms 2016-11-21, Platforms 2017-01-23
    • v3.4

      mongodump can get the _id index spec from the listCollections output:

      > db.runCommand({listCollections: 1})
{
	"cursor" : {
		"id" : NumberLong(0),
		"ns" : "test.$cmd.listCollections",
		"firstBatch" : [
			{
				"name" : "c",
				"type" : "collection",
				"options" : {
					
				},
				"info" : {
					"readOnly" : false
				}
				“idIndex”: {
					"v" : 1,
					"key" : {
						"_id" : 1
						},
					"name" : "_id_",
					"ns" : "test.c"
				}
			},
			…
]	
}
}

      Note that the idIndex field will not be present for views or for collections without an _id index (i.e. autoIndexId: false).
      mongorestore can specify the spec for the _id index in the create command:

      > db.runCommand({create: "c", 
idIndex: {v: 1, key: {_id: 1}, name: “_id_”, ns: “test.c”}})

            Assignee:
            Matt Cotter (Inactive)
            Reporter:
            Tess Avitabile (Inactive)
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              Created:
              Updated:
              Resolved: