I was just informed that the document "The Enhanced-Sort Facility for z/Architecture" (SA22-1082-00) is available for download. See https://www-01.ibm.com/servers/resourcelink/lib03010.nsf/0/ADDD4A7958501EBD852585E3005679F7/$file/SA22-1082-00.pdf (you will need an IBM ID for this site).
For those of you who may have stumbled over the complexities of the earlier sorting assists (i.e., COMPARE AND FORM CODEWORD and UPDATE TREE), things just got substantially more complicated!
