public Builder setModelBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      model_ = value;
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Optional. The language detection model to be used.

Format:
`projects/{project-number-or-id}/locations/{location-id}/models/language-detection/{model-id}`

Only one language detection model is currently supported:
`projects/{project-number-or-id}/locations/{location-id}/models/language-detection/default`.

If not specified, the default model is used.
</pre>

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

@param value The bytes for model to set.
@return This builder for chaining.
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/DetectLanguageRequest.java