I can't find the answer to this in the documentation. I have created a firebase cloud function which listens to the database and gets triggered when a doc in the database changes.

What I want the function to do is to gather information from the database, other than the information listened to in the first place, and then work with that information. How would I gather information from the Firestore database using firebase admin?

Down below is the code I have written so far:

exports.costCalculation = functions.firestore
  .document("questions/{docId}/post_publish_information/outcome_information")
  .onUpdate((change, context) => {
    const predictions = admin
      .firestore()
      .document("questions/{docId}/post_publish_information/predictions");
    console.log(predictions);
  });