public static com.google.cloud.speech.v2.UpdateCustomClassRequest parseDelimitedFrom(
      java.io.InputStream input) throws java.io.IOException {
    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
  }
<pre>
If set, validate the request and preview the updated CustomClass, but do
not actually update it.
</pre>

<code>bool validate_only = 4;</code>

@return The validateOnly.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/UpdateCustomClassRequest.java