[Answered ]-How to build the index of a single app in Django Haystack – elasticsearch?

https://django-haystack.readthedocs.org/en/latest/management_commands.html?highlight=update_index#update-index

./manage.py update_index

This command can be run specifying a single app and can also update the index for objects that have been updated within a certain timeframe. This makes the indexing process much more efficient so it’s well worth learning how to make good use of it.