> db.runCommand({create: "myts", timeseries: {timeField: "t", metaField: "sensor"}})
{
	"ok" : 1,
	...
}

> db.runCommand({insert: "myts", documents: [{"metadata": { "sensor": 2},  "u": ISODate("2021-05-18T00:00:00.000Z"), "temp": 12}]})
{
	"n" : 1,
	"writeErrors" : [
		{
			"index" : 0,
			"code" : 2,
			"errmsg" : "'t' must be present and contain a valid BSON UTC datetime value"
		}
	],
	"ok" : 1,
	...
}

> db.myts.find().itcount()
0

> db.runCommand({insert: "basic4", documents: [{_id: 1}]})
{
	"n" : 0,
	...
	"writeErrors" : [
		{
			"index" : 0,
			"code" : 11000,
			"errmsg" : "E11000 duplicate key error collection: test.basic4 index: _id_ dup key: { _id: 1.0 } found value: RecordId(3)",
			"keyPattern" : {
				"_id" : 1
			},
			"keyValue" : {
				"_id" : 1
			},
			"foundValue" : NumberLong(3),
			"duplicateRid" : NumberLong(3)
		}
	],
	"ok" : 1,
        ...
}