private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.storagebatchoperations.v1.BucketList.Bucket,
            com.google.cloud.storagebatchoperations.v1.BucketList.Bucket.Builder,
            com.google.cloud.storagebatchoperations.v1.BucketList.BucketOrBuilder>
        getBucketsFieldBuilder() {
      if (bucketsBuilder_ == null) {
        bucketsBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.storagebatchoperations.v1.BucketList.Bucket,
                com.google.cloud.storagebatchoperations.v1.BucketList.Bucket.Builder,
                com.google.cloud.storagebatchoperations.v1.BucketList.BucketOrBuilder>(
                buckets_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
        buckets_ = null;
      }
      return bucketsBuilder_;
    }
<pre>
Required. List of buckets and their objects to be transformed. Currently,
only one bucket configuration is supported. If multiple buckets are
specified, an error will be returned.
</pre>

<code>
repeated .google.cloud.storagebatchoperations.v1.BucketList.Bucket buckets = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/BucketList.java