Out of the box, Elasticsearch's mappings in the database are populated by the mappings.yaml. It's alwasy possible to re-populate the database by "resetting" the configuration. You often need to do this after an upgrade to get all the new defaults. But if you do that, you lose all your customizations. It would be nice to have a "user_edited" to denote mappings that have been added/edited by users via the web UI. Having a visual cue that these are custom fields would be great. (If we had an option to retain those fields during a reset, that would be even more amazing. Although that's more complicated.)