public static Builder newBuilder() {
      return DEFAULT_INSTANCE.toBuilder();
    }
<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