Force artist index values

[simoncn]

To ignore AlbumArtist tags completely, set the aliasTags property to AlbumArtist:nil. This should enable you to see Artist.indexFormat values in the Artist index.

The previousAlbumArtistDisplayRole setting is an internal MinimServer property that was used by MinimServer 0.8 and is no longer used by MinimServer 2. Your post is a timely reminder for me to tidy up the .properties file by removing this setting.