@java.lang.Override
    protected Builder newBuilderForType(
        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
      Builder builder = new Builder(parent);
      return builder;
    }
<pre>
Required. The id of the instance.
</pre>

<code>string instance_id = 3 [(.google.api.field_behavior) = REQUIRED];</code>

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