How to override faulty behaviour of Haystack highlighting

myapp.highlighting.py

import re
from haystack.utils.highlighting import Highlighter as FaultyHighlighter


    class Highlighter(FaultyHighlighter):
        """Highlighter that fixes the issue with highlighting parts of words:
        https://github.com/django-haystack/django-haystack/issues/378 
        """
        
        def find_highlightable_words(self):
            word_positions = {}
    
            lower_text_block = self.text_block.lower()
    
            for word in self.query_words:
                # Use a regular expression to search by whole words
                # \b corresponds to a word boundary
                matches = re.finditer(r'\b%s\b' % word, lower_text_block)
                
                if matches:
                    word_positions[word] = [match.start() for match in matches]
                
            return word_positions

settings.py

HAYSTACK_CUSTOM_HIGHLIGHTER = 'myapp.highlighting.Highlighter'

Thanks for this sollution.