Using the Job DSL Plugin version 1.68 the 'lightweight' method is ignored when creating a pipeline job:

pipelineJob('Pipeline') {
    description 'Pipeline Test'

    definition {
        cpsScm {
            lightweight(true)

            scm {
                git('http://u.r.l/repo.git')
            }
        }
    }
}

There is no error message, it's just that 'lightweight' is silently ignored.

Tested on the Job DSL Playground as well as Windows Server 2008 R2, Jenkins 2.100 running on Tomcat 8.