Net::Amazon::Validate::ItemSearch::us::Merchants - valid search indicies for the us locale and the Merchants SearchIndex.

The default value is Title, unless mode is specified.

The list of available values are:

    Actor
    Artist
    AudienceRating
    Author
    Brand
    BrowseNode
    City
    Composer
    Conductor
    Director
    Keywords
    Manufacturer
    MusicLabel
    Neighborhood
    Orchestra
    Publisher
    TextStream
    Title