public com.google.protobuf.ByteString getTopicBytes() {
      java.lang.Object ref = topic_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        topic_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
The name of the Pub/Sub topic to publish job completion notification
to. For example: `projects/{project}/topics/{topic}`.
</pre>

<code>string topic = 1;</code>

@return The bytes for topic.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/PubsubDestination.java