text: Title: Using Vectorizer Model After Updating Topics (after reducing outliers)
  Body: Hello,
  
  Do you have any advice how to repeat text preprocessing steps after updating topic models (following outlier reduction technique)? I was able to get clean representative words using topic_model.visualize_barchart before using topic_model.update_topics. However, all my specifications in vectorizer_model for the original model do not transfer to updated one. Are there any steps I am missing? Basically, my visualization of top words includes mainly stopwords after updating topics, which needs to be cleaned again I assume.
  
  <img width="976" alt="Screenshot 2023-06-16 at 7 49 07 PM" src="https://github.com/MaartenGr/BERTopic/assets/127628938/5c178954-aa72-4ac7-920a-c2742c535c3c">
  