@java.lang.Override
  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
    Builder builder = new Builder(parent);
    return builder;
  }
<pre>
Required. There must be no files under 'output_uri_prefix'.
'output_uri_prefix' must end with "/" and start with "gs://", otherwise an
INVALID_ARGUMENT (400) error is returned.
</pre>

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

@return The bytes for outputUriPrefix.
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/GcsDestination.java