public com.google.protobuf.ByteString getOperationBytes() {
      java.lang.Object ref = operation_;
      if (ref instanceof 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