public ApiFuture<GenerateContentResponse> generateContentAsync(String text) throws IOException {
    return generateContentAsync(ContentMaker.fromString(text));
  }
Asynchronously generates content from generative model given a text.

@param text a text message to send to the generative model
@return a {@link com.google.api.core.ApiFuture} represents the response of an asynchronous
    generateContent request
@throws IOException if an I/O error occurs while making the API call
java-vertexai/google-cloud-vertexai/src/main/java/com/google/cloud/vertexai/generativeai/GenerativeModel.java