[Python] How to update a single record for django-haystack?

I'm a haystack beginner, and I'm trying to figure out how to update a document.

I have the following SearchIndex:

class ProductIndex(indexes.SearchIndex, indexes.Indexable):
text = indexes.CharField(document=True) # contains keywords associated with the product
name= indexes.CharField(model_attr='name')

def get_model(self):
return Product

def prepare_text(self, obj):
return [tag.keyword for tag in obj.productkeywords_set.all()]


I want to update the text field when a user adds a new product keyword. I have over 80k records, so it takes a very long time when I use python manage.py update_index. Is there a way to update just one document?

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