@java.lang.Override
  public com.google.protobuf.ByteString getOperationBytes() {
    java.lang.Object ref = operation_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      operation_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Output only. The unique operation resource name.
Format: projects/{project}/locations/global/operations/{operation}.
</pre>

<code>string operation = 1 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for operation.
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/OperationMetadata.java