How are buckets stored within shard?

We are looking to use buckets as our "primary key" (e.g. to keep all documents for a given account together, in one shard).

As a single shard will probably have a million or more documents, spanning 50-500 accounts, we are concerned with optimizing queries (e.g. minimizing the IO required to serve a query).

Where can we find information about how buckets are stored within the shard?

Thank you!

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