@java.lang.Override
  public Builder toBuilder() {
    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
  }
<pre>
The time when the operation is finished and
[google.longrunning.Operation.done][google.longrunning.Operation.done] is
set to true.
</pre>

<code>.google.protobuf.Timestamp end_time = 10;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/BatchTranslateDocumentResponse.java