private void ensureBucketsIsMutable() {
      if (!((bitField0_ & 0x00000001) != 0)) {
        buckets_ =
            new java.util.ArrayList<com.google.cloud.storagebatchoperations.v1.BucketList.Bucket>(
                buckets_);
        bitField0_ |= 0x00000001;
      }
    }
<pre>
Describes list of buckets and their objects to be transformed.
</pre>

Protobuf type {@code google.cloud.storagebatchoperations.v1.BucketList}
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/BucketList.java