public Builder setEndTime(com.google.protobuf.Timestamp value) {
      if (endTimeBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        endTime_ = value;
      } else {
        endTimeBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
The time when the batch request is finished and
[google.longrunning.Operation.done][google.longrunning.Operation.done] is
set to true.
</pre>

<code>.google.protobuf.Timestamp end_time = 3;</code>
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/BatchOperationMetadata.java