Storing 1000+ nodes or properties on the same level leads to performance issues with JCR/Jackrabbit. Since we potentially store more labels than that (up to 10k by default), we should do so in a hierarchical structure with always less than 1k neighbours on any level.

Current location of labels (on demo): https://demo.magnolia-cms.com/.magnolia/admincentral#app:configuration:browser;/modules/periscope-result-ranker/persistence/labels:treeview: