{
    scale: N, // scales sizes in result
    indexDetails: true/false, // toggles display of indexDetails in result. Defaults to false
    indexDetailsKey: {x: 1}, //  requires indexDetails to be true. filters indexDetails subdocument to display single index corresponding to given index key (uses getIndexes() output)
    indexDetailsName: "x_1", //  requires indexDetails to be true. filters indexDetails subdocument to display single index corresponding to given index name (uses getIndexes() output).
}