Best way to store large lists in mongodb

Question

What is the best way to store large arrays / lists in mongodb without compromising query performance?

I have a large collection (> 1M records), which consists of lists. Each list has a random length from 0 to> 40 thousand records.

I never change / change list indices - I add only new elements to the end

When accessing data, I should be able to search by index / fields in this list. For example, I could run such queries:

myCollection.find({list: 'awesomeList', index: {$gt: 500}})
myCollection.find({list: 'otherList', name: 'Karl'})

So far I have had several ideas for moving forward:

• Save each list item as a document with an index member
• Save each list item as a document using a special ObjectId to reflect the index
• Store list items in parent in binary tree structure (???)