docs: public ServiceCall<Void> addCorpus(AddCorpusOptions addCorpusOptions) {
      Validator.notNull(addCorpusOptions, "addCorpusOptions cannot be null");
      String[] pathSegments = { "v1/customizations", "corpora" };
      String[] pathParameters = { addCorpusOptions.customizationId(), addCorpusOptions.corpusName() };
      RequestBuilder builder = RequestBuilder.post(RequestBuilder.constructHttpUrl(getEndPoint(), pathSegments,
          pathParameters));
      Map<String, String> sdkHeaders = SdkCommon.getSdkHeaders("speech_to_text", "v1", "addCorpus");
      for (Entry<String, String> header : sdkHeaders.entrySet()) {
        builder.header(header.getKey(), header.getValue());
      }
      builder.header("Accept", "application/json");
      if (addCorpusOptions.allowOverwrite() != null) {
        builder.query("allow_overwrite", String.valueOf(addCorpusOptions.allowOverwrite()));
      }
      builder.body(RequestUtils.inputStreamBody(addCorpusOptions.corpusFile(), "text/plain"));
      return createServiceCall(builder.build(), ResponseConverterUtils.getVoid());
    }