public Builder mergeTransferManifest(
          com.google.storagetransfer.v1.proto.TransferTypes.TransferManifest value) {
        if (transferManifestBuilder_ == null) {
          if (((bitField0_ & 0x00001000) != 0)
              && transferManifest_ != null
              && transferManifest_
                  != com.google.storagetransfer.v1.proto.TransferTypes.TransferManifest
                      .getDefaultInstance()) {
            getTransferManifestBuilder().mergeFrom(value);
          } else {
            transferManifest_ = value;
          }
        } else {
          transferManifestBuilder_.mergeFrom(value);
        }
        if (transferManifest_ != null) {
          bitField0_ |= 0x00001000;
          onChanged();
        }
        return this;
      }
<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