#Key Value

Is there a way to use the %JSON.Adaptor to project readable JSON when a property is defined as a %Integer but with a DISPLAYLIST ? 

Class User.CExampleJSON Extends (%RegisteredObject, %JSON.Adaptor, %XML.Adaptor)
{

Property something As %Integer(DISPLAYLIST = ",OK,Error,Warning", VALUELIST = ",0,1,2") [ InitialExpression = 0 ];

ClassMethod RunMe()
{
      set obj = ..%New()
      set obj.something = 2

      do obj.%JSONExportToString(.string)
      write "JSON : " _ string,!!!

      write "Content  : " _ ..somethingLogicalToDisplay(obj.

I have a unique index on two properties in a class, and I want to open the instance by index key with one of the two properties is set to the empty string. Is this possible to perform?

What are the best practices for choosing a shard key in InterSystems IRIS to ensure long-term scalability without needing major refactoring later?