CoverageSlicesCatalog always used an hidden H2 DB to store granules
index related to a specific file.
Starting from 14.x it also can be setup on top of a shared PostGIS
Using a PostGIS shared index, we need to add a LOCATION attribute
to distinguish the different granules, as well as add a Filter
setting the LOCATION value to each query from a reader
(1 reader <-> 1 file <-> 1 location)