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Mongoose version >= 4.0 has a timestamps option which creates an updatedAt and createdAt field for schemas when timestamps is set to true.
http://mongoosejs.com/docs/guide.html#timestamps
Are the updatedAt and createdAt fields indexed?
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Mongoose timestamps are supported by the schema. Timestamps save the current time of the document created and also when it was updated in form of a Date by turning it true. When set to true, the mongoose creates two fields as follows: createdAt: Date representing when the document was created.
Indexes are defined through ensureIndex every time a model is compiled for a certain connection / database. This means that indexes will only be ensured once during the lifetime of your app.
A Mongoose schema defines the structure of the document, default values, validators, etc., whereas a Mongoose model provides an interface to the database for creating, querying, updating, deleting records, etc.
What is a SchemaType? You can think of a Mongoose schema as the configuration object for a Mongoose model. A SchemaType is then a configuration object for an individual property. A SchemaType says what type a given path should have, whether it has any getters/setters, and what values are valid for that path.
No they are not indexed, You have to do indexing by yourself, like any other field.
animalSchema.index({"createdAt": 1});
animalSchema.index({"updatedAt": 1});
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