How to properly use the new IDL and include Gradle plugins?

Question

gradle

Hello,
I am adding two plugins .

plugins {
    id 'idea'
    id 'java'
}

Idea starts saying something went wrong:
Warning: root project 'hlidskjalf-unit-j': Unable to resolve additional project configuration.
Details: groovy.lang.MissingPropertyException: No such property: id for class: org.gradle.api.internal.artifacts.DefaultResolvedArtifact
Possible solutions: file
Warning: root project 'hlidskjalf-unit-j': Unable to resolve additional project configuration.
Details: groovy.lang.MissingPropertyException: No such property: id for class: org.gradle.api.internal.artifacts.DefaultResolvedArtifact
Possible solutions: file
I open this link and read:

To apply a core plugin, the short name can be used:

those. the version parameter is optional, the entry is valid.
What am I doing wrong?