Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0
Run the Gradle build with a command line argument --warning-mode=all to see what exactly the deprecated features are.
It will give you a detailed description of found issues with links to the Gradle docs for instructions how to fix your build.
Adding --stacktrace to that, you will also be able to pinpoint where the warning comes from, if it's triggered by outdated code in one of the plugins and not your build script.
Try this one
cd android && ./gradlew clean && ./gradlew :app:bundleRelease