docs: public ServiceCall<Void> trainLanguageModel(TrainLanguageModelOptions trainLanguageModelOptions) {
      Validator.notNull(trainLanguageModelOptions, "trainLanguageModelOptions cannot be null");
      String[] pathSegments = { "v1/customizations", "train" };
      String[] pathParameters = { trainLanguageModelOptions.customizationId() };
      RequestBuilder builder = RequestBuilder.post(RequestBuilder.constructHttpUrl(getEndPoint(), pathSegments,
          pathParameters));
      Map<String, String> sdkHeaders = SdkCommon.getSdkHeaders("speech_to_text", "v1", "trainLanguageModel");
      for (Entry<String, String> header : sdkHeaders.entrySet()) {
        builder.header(header.getKey(), header.getValue());
      }
      builder.header("Accept", "application/json");
      if (trainLanguageModelOptions.wordTypeToAdd() != null) {
        builder.query("word_type_to_add", trainLanguageModelOptions.wordTypeToAdd());
      }
      if (trainLanguageModelOptions.customizationWeight() != null) {
        builder.query("customization_weight", String.valueOf(trainLanguageModelOptions.customizationWeight()));
      }
      return createServiceCall(builder.build(), ResponseConverterUtils.getVoid());
    }