private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v1p1beta1.RecognitionConfig,
            com.google.cloud.speech.v1p1beta1.RecognitionConfig.Builder,
            com.google.cloud.speech.v1p1beta1.RecognitionConfigOrBuilder>
        getConfigFieldBuilder() {
      if (configBuilder_ == null) {
        configBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v1p1beta1.RecognitionConfig,
                com.google.cloud.speech.v1p1beta1.RecognitionConfig.Builder,
                com.google.cloud.speech.v1p1beta1.RecognitionConfigOrBuilder>(
                getConfig(), getParentForChildren(), isClean());
        config_ = null;
      }
      return configBuilder_;
    }
<pre>
Required. Provides information to the recognizer that specifies how to
process the request.
</pre>

<code>
.google.cloud.speech.v1p1beta1.RecognitionConfig config = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/RecognizeRequest.java