Remove `ScriptDocValues#getValues`

[nik9000]

I expect ScriptDocValues#getValues was added for backwards compatibility a long time ago but at this point I don't think we need it. At this point everything every script that does doc.foo.values.something can do doc.foo.something instead.

Should we drop ScriptDocValues#getValues in 6.0?

[clintongormley]

+1 (with appropriate deprecation logging)

[nik9000]

Talked among a small group - we're fine with removing. I'll put together a change to deprecate in 5.x and remove in 6.0.

[jdconrad]

@nik9000 Was this ever completed?

[nik9000]

No, but it feels like a legit thing we should do. Like, we should deprecate it in 6.x and remove in master.