getDatasetValueByIndex no longer available as an expression-function?

Used version: 8.0.4.
Function still exists in online manual:
https://docs.inductiveautomation.com/display/DOC80/getDatasetValueByIndex

As far as I know it’s only ever been available in transaction group expressions.

@JordanCClark is correct. Also, it’s currently considered deprecated and may be removed entirely in some future release.

Thank you!