This is an omnibus bug is for formally deprecating the GRS-1 indexing mode for Zebra, as decided during the 23 July development meeting. The relevant coding guideline is: "The DOM Zebra indexing mode is now the standard supported method for Koha. The GRS-1 indexing mode is deprecated for all record types and MARC flavours. New Koha patches that update index definitions must change the DOM indexing definitions. If a patch is intended to be backported to a maintenance release, changes to GRS-1 index definitions should be kept in a separate patch." Any bugs that would prevent the ultimate removal of the GRS-1 indexing configuration should be entered of blockers of this omnibus.
GRS-1 indexing mode has already been deprecated.