public Builder clearValidateOnly() {
      bitField0_ = (bitField0_ & ~0x00000004);
      validateOnly_ = false;
      onChanged();
      return this;
    }
<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 This builder for chaining.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/UpdateCustomClassRequest.java