Only index part of the pages with jekyll-algolia

I am trying to index my site https://www.motionsplan.dk/ which is a Jekyll site - GitHub - motionsplan/motionsplan-dk-jekyll.

Right now there are too many nodes, so I would like to reduce the number of nodes.

Therefore I only want to create nodes on the p’s in the section.page__content as that content is the real content of the page without sidebar etc. Is it possible, so I can reduce the number of nodes?