private com.google.protobuf.SingleFieldBuilderV3<
              com.google.storagetransfer.v1.proto.TransferTypes.TransferManifest,
              com.google.storagetransfer.v1.proto.TransferTypes.TransferManifest.Builder,
              com.google.storagetransfer.v1.proto.TransferTypes.TransferManifestOrBuilder>
          getTransferManifestFieldBuilder() {
        if (transferManifestBuilder_ == null) {
          transferManifestBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.storagetransfer.v1.proto.TransferTypes.TransferManifest,
                  com.google.storagetransfer.v1.proto.TransferTypes.TransferManifest.Builder,
                  com.google.storagetransfer.v1.proto.TransferTypes.TransferManifestOrBuilder>(
                  getTransferManifest(), getParentForChildren(), isClean());
          transferManifest_ = null;
        }
        return transferManifestBuilder_;
      }
<pre>
A manifest file provides a list of objects to be transferred from the data
source. This field points to the location of the manifest file.
Otherwise, the entire source bucket is used. ObjectConditions still apply.
</pre>

<code>.google.storagetransfer.v1.TransferManifest transfer_manifest = 15;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java