@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
    }
    for (int i = 0; i < requests_.size(); i++) {
      output.writeMessage(2, requests_.get(i));
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(3, getOptions());
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(batchId_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 4, batchId_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Output only. The batch ID.
</pre>

<code>string batch_id = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for batchId.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/BatchRunProcessRequest.java