public Builder setLanguageCodeBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      languageCode_ = value;
      bitField0_ |= 0x00000020;
      onChanged();
      return this;
    }
<pre>
Output only. The [BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt)
language tag of the language in this result. This language code was
detected to have the most likelihood of being spoken in the audio.
</pre>

<code>string language_code = 6 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@param value The bytes for languageCode to set.
@return This builder for chaining.
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/StreamingRecognitionResult.java