{
	"n" : 0,
	"writeErrors" : [
		{
				“index”: 0,
  		    		"code" : 121,
          			“errInfo”: {<object describing reason(s) for failure>},
  				"errmsg" : "Document failed validation"
   		}
	],
		“ok”: 1
}

{"t":{"$date": <date>},"s":"W",  "c":"STORAGE",  "id":20294,   "ctx":"conn","msg":"Document would fail validation","attr":{"namespace":<namespace>,"document":<document which failed validation>,"errInfo":<object describing the reason(s) for failure>}}

 {$jsonSchema: {
	bsonType: "object",
	required: [ "name", "year", "major", "address" ],
	properties: {
		name: {
			bsonType: "string",
			description: "must be a string and is required"
		},
		year: {
			bsonType: "int",
			minimum: 2017,
			maximum: 3017,
		 	description: "must be an integer in [ 2017, 3017 ] and is required"
		},
		major: {
			enum: [ "Math", "English", "Computer Science", "History", null ],
			description: "can only be one of the enum values and is required"
		},
		gpa: {
			bsonType:  "double" ,
			description: "must be a double if the field exists"
		},
		address: {
			bsonType: "object",
			required: [ "city" ],
			properties: {
	 			street: {
					bsonType: "string",
					description: "must be a string if the field exists”
				},
				city: {
					bsonType: "string",
				"description": "must be a string and is required"
				}
			}
		}
	}
}

"errInfo" : {
	"failingDocumentId" : ObjectId("5f85f78bccef9666ae09c3c1"),
		"details" : {
			"operatorName" : "$jsonSchema",
			"schemaRulesNotSatisfied" : [
				{
					"operatorName" : "properties",
					"propertiesNotSatisfied" : [
						{
							"propertyName" : "year",
							"details" : [
								{
									"operatorName" :"bsonType",
									"specifiedAs" : {
										"bsonType" : "int"
									},
									"reason" : "type did not match",
									"consideredValue" : 2019,
									"consideredType" : "double"
								}
							]
						}
					]
				},
				{
					"operatorName" : "required",
					"specifiedAs" : {
						"required" : [
							"name",
							"year",
							"major",
							"address"
						]
					},
					"missingProperties" : [
						"address"
					]
				}
			]
		}
}