Django vs Node.js backend for Search Engine (Elasticsearch)

My company is building a search engine for a client. Currently we have to build it from scratch so all the web scraping, insertion and querying will be implemented by us. We decided to use MongoDB as our database and sync it to elasticsearch with mongo-connector. However we cant decide which backend to choose Django or Node.JS.

• Is there any added pros for either of these backends?

• All our web scraping is done in python so will integration be a problem if we use Node?

• Also one of my coworkers suggested that software packaging will be
  better if we use Django. I couldn't quite understand why software packaging will be an issue if we use Node.

Thanks for your time :)

via Sourav Kanta