What does "Legacy Mode" mean for 1.13 essentials?

Description

On the jenkins page

https://hub.spigotmc.org/jenkins/job/Spigot-Essentials/

It says at the top

#27+ = 1.13 (Legacy Mode - Not Recommended)

What is Legacy Mode?

I am having difficulty getting the permission
-essentials.build.*

to work, everyone is still able to build, i'm wondering if this "Legacy Mode" is related.

Environment

None

Status

Assignee

RobertG

Reporter

malon malon

Affects versions

Priority

Normal
Configure