Where is PostCompile in 2.3.x [documentation]

The JavaTest doc ( https://www.playframework.com/documentation/2.3.x/JavaTest ) says that

> Note: Applications using Ebean ORM may be written to rely on Play’s automatic getter/setter generation. Play also rewrites field accesses to use the generated getters/setters. Ebean relies on calls to the setters to do dirty checking. In order to use these patterns in JUnit tests, you will need to enable Play’s field access rewriting in test by adding the following to build.sbt:
>
>    compile in Test <<= PostCompile(Test)

But adding `compile in Test <<= PostCompile(Test)` in build.sbt results in

    error: not found: value PostCompile

Where is that needle hidden in 2.3.x? And maybe the documentation should be improved to include that information?