public com.google.storagetransfer.v1.proto.TransferTypes.AwsS3Data.Builder
          getAwsS3DataSourceBuilder() {
        return getAwsS3DataSourceFieldBuilder().getBuilder();
      }
<pre>
An AWS S3 data source.
</pre>

<code>.google.storagetransfer.v1.AwsS3Data aws_s3_data_source = 2;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java