Is there a way to read every entry in a Solr database one at a time?

I am trying to update the entries in a Solr database using the pysolr add() and commit() methods. I have a massive database and I need to figure out a way to change every entry one at a time. I know I can just query the whole database and save it as a list, but that requires a ton of memory. So I'm wondering if anyone knows of a built-in functionality that will allow me to read the entries one at a time without saving the whole database in memory.