public Subclass enableUseArnRegion() {
        this.useArnRegionEnabled = true;
        return getSubclass();
    }
<p>Enables using the region from ARNs on clients built with the builder.</p>
@return This object for method chaining.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/AmazonS3Builder.java