Consider creating a clustered index to optimize for multi level deep treeing. (this needs some thought)

## Feature Request

See #703 for details

Start by reading issue #703, which this request cites for its context. Determine whether clustered indexing is appropriate for the multi-level treeing workload and identify the affected data path before proposing a change. Done means the indexing approach and its expected optimization are clearly specified and reviewed.

Written by the indexing model from the issue text.