solr: tree-like structure DIH

Question

I'm trying to denormalize a tree-like structure into solr.

I mean, into my relational database I've this:

                                      +------------+
                                      |            |
+--------------+             +--------v--------+   |
|              |             |                 |   |
|   Employee   +-----------> |   Department    +---+
|              |             |                 |
+--------------+             +-----------------+

Any department can have any subdepartment.

Are there any tips or tricks in order to denormalize this kind of relationships into solr?

I bit more of details.

Currently, I've created an index storing all denormalized employees.

Something like:

employee_id, employee_name, department_id, depatment_name

However, I need to make searches like:

  Department (210)
    Deparment1 (100)
      Department-1.2 (50)
      Department-1.3 (50)
    Department2 (110)
      Department-2.2 (40)
      Department-2.3 (70)

The problem using my approach employees only have the current department, department tree associated is not available...

Any ideas about how to get it?

I hope I've explained so well...