docs: public ServiceCall<Void> addWord(AddWordOptions addWordOptions) {
      Validator.notNull(addWordOptions, "addWordOptions cannot be null");
      String[] pathSegments = { "v1/customizations", "words" };
      String[] pathParameters = { addWordOptions.customizationId(), addWordOptions.wordName() };
      RequestBuilder builder = RequestBuilder.put(RequestBuilder.constructHttpUrl(getEndPoint(), pathSegments,
          pathParameters));
      Map<String, String> sdkHeaders = SdkCommon.getSdkHeaders("speech_to_text", "v1", "addWord");
      for (Entry<String, String> header : sdkHeaders.entrySet()) {
        builder.header(header.getKey(), header.getValue());
      }
      builder.header("Accept", "application/json");
      final JsonObject contentJson = new JsonObject();
      if (addWordOptions.word() != null) {
        contentJson.addProperty("word", addWordOptions.word());
      }
      if (addWordOptions.soundsLike() != null) {
        contentJson.add("sounds_like", GsonSingleton.getGson().toJsonTree(addWordOptions.soundsLike()));
      }
      if (addWordOptions.displayAs() != null) {
        contentJson.addProperty("display_as", addWordOptions.displayAs());
      }
      builder.bodyJson(contentJson);
      return createServiceCall(builder.build(), ResponseConverterUtils.getVoid());
    }