Optional build profiles with Category X licenses

[Mike Thomsen]

I know the official binaries cannot contain Category X license code,
but is it allowable to have optional build profiles that integrate
Category X licensed code? An example scenario that lead me to wonder
if this is doable is I would like to try to add optional support for
Elastic's Painless as script engine, but it's covered under a Category
X license.

Thanks,

Mike