Made the element search parameter into a list instead of a comma separated string.

client/conf.js

 window.nomadEnv = {
   //apiRoot: "https://labdev-nomad.esc.rzg.mpg.de/dev/nomad/encyclopedia-api/",
-  apiRoot: "https://nomad-lab.eu/prod/rae/api/encyclopedia/",
-  //apiRoot: "http://localhost:8000/fairdi/nomad/latest/api/encyclopedia/",
+  //apiRoot: "https://nomad-lab.eu/prod/rae/api/encyclopedia/",
+  apiRoot: "http://localhost:8000/fairdi/nomad/latest/api/encyclopedia/",
   keycloakBase: 'https://nomad-lab.eu/fairdi/keycloak/auth/',
   keycloakRealm: 'fairdi_nomad_test',
   keycloakClientId: 'nomad_gui_dev'

client/src/search-mod/SearchMod.js

@@ -223,7 +223,7 @@ class SearchMod {
         });
 
         if (elements.length > 0)
-          queryObj.search_by.element = elements.join(',');
+          queryObj.search_by.elements = elements;
 
         let exclusiveEl = this.element.querySelector('#exclusive-search:checked');
         let restrictedEl = this.element.querySelector('#restricted-search:checked');