根据最新文档
将 Android Studio 升级至 3.0.0 或更高版本，去掉下面的配置

defaultConfig.jackOptions.enabled = true
或者
jackOptions {
            enabled true
        }

所以整体配置如下：

android {
  ...
  // Configure only for each module that uses Java 8
  // language features (either in its source code or
  // through dependencies).
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
}