Fix Saved Search restoration/execution with hierarchical vocabularies with 3 levels

This ticket is the following of WEBUI-1386 which provided a proper fix for hierarchical vocabularies with 2 levels.

Pre-requisite: install the attached jar to nxserver/plugins

Steps to reproduce:

1. Navigate to your personal workspace
2. Click on the + button and choose "document operational"
3. In the creation form, set the Title with Approv3 and select "Cars" in the dropdown menu for Typology. Then validate with the Create button
4. Repeat the previous step to create another "document operational" document with title=Approv4 and select Bus for the Typology field
5. Navigate to the Search menu named "Approval search"
6. Once the Form panel is open, click on Search => the 2 "document operational" documents will be displayed
7. Select "Cars" in the dropdown menu for Typology and click on Search => only the document Approv3 is displayed, as expected
8. Save the search with the name "cars"
9. In the Dropdown menu on top of the Form panel, select "Filters" to remove the previous choice
10. Then select "cars" => observe that the Typology field is set
11. Click on the Search button
12. Observe that no document is returned <= that's the bug

When analyzing the payloads, we see :

• for a normal search, the value is

  operational_typology: %5B%220001%2FDOCROA%2FCAR%22%5D

  decoded into ["0001/DOCROA/CAR"]

• for the saved search, the value is

  operational_typology: %5B%22DOCROA%2FCAR%22%5D

  decoded into ["DOCROA/CAR"]

=> the first parent is missing in the payload submitted by the saved search.

Note that the value is correctly saved in the SavedSearch document

        "PP_Search_DocumentOperational_pp:operational_typology": [
            "0001/DOCROA/CAR"
        ],