key is a map of fields to index type. Values may either be the standard Mongo 1 and -1 for ascending / descending, the strings ASC / DESC, or the string TEXT.

index.create(["dateAdded" : Index.ASC])

Note that should key contain more than 1 entry, it must be ordered.

The options parameter is merged with the Mongo command. Options are numerous (see the MongoDB documentation for details) but common options are:

Name	Type	Desc
background	Bool	Builds the index in the background so it does not block other database activities. Defaults to `false`.
sparse	Bool	Only reference documents with the specified field. Uses less space but behave differently in sorts. Defaults to `false`.
expireAfterSeconds	Int	Specifies a Time To Live (TTL) in seconds that controls how long documents are retained.
weights	Map	Specifies the relative weights of fields to use in text searching. See Control Search Results with Weights.
default_language	Str	The language used to create text indexes. See Supported Text Search Languages. Defaults to `english`.

@see http://docs.mongodb.org/manual/reference/command/createIndexes/

drop

Source

This drop(Bool force := false)

Drops this index, but only if it exists.

If force is true then the index is dropped regardless. Note this may result in an error if the index doesn't exist.

@see http://docs.mongodb.org/manual/reference/command/dropIndexes/

ensure

Source

Bool ensure(Str:Obj key, Bool? unique := false, Str:Obj options := [:])

Ensures this index exists. If the index does not exist, it is created. If it exists but with a different key / options, it is dropped and re-created.

Returns true if the index was (re)-created, false if nothing changed.

index.ensure(["dateAdded" : Index.ASC])

Note that should key contain more than 1 entry, it must be ordered.

The options parameter is merged with the Mongo command. Options are numerous (see the MongoDB documentation for details) but common options are:

Name	Type	Desc
background	Bool	Builds the index in the background so it does not block other database activities.
sparse	Bool	Only reference documents with the specified field. Uses less space but behave differently in sorts.
expireAfterSeconds	Int	Specifies a Time To Live (TTL) in seconds that controls how long documents are retained.
weights	Map	Specifies the relative weights of fields to use in text searching. See Control Search Results with Weights.
default_language	Str	The language used to create text indexes. See Text Search Languages for a list of valid options. Defaults to `english`.