Bring back loghost, graylog, elasticsearch6 roles

- frozen packages for graylog and elasticsearch6-oss taken from our
  22.05/22.11 platform versions
- services/roles taken from 22.05/22.11 platform versions
- use current upstream Elasticsearch module which is still compatible
  with ES 6

PL-132166

nixos/platform/static.nix

@@ -142,6 +142,7 @@ with lib;
       # removed by upstream, we want to keep it
       memcached = 177;
       redis = 181;
+      graylog = 243;
       solr = 309;
 
       # Same as elasticsearch

nixos/roles/default.nix

@@ -14,13 +14,16 @@ in {
     ./ceph/osd.nix
     ./ceph/rgw.nix
     ./devhost
+    ./elasticsearch.nix
     ./external_net
     ./ferretdb.nix
     ./gitlab.nix
+    ./graylog.nix
     ./jitsi
     ./k3s
     ./lamp.nix
     ./loki.nix
+    ./loghost.nix
     ./mailout.nix
     ./mailserver.nix
     ./matomo.nix
@@ -42,10 +45,6 @@ in {
     ./webproxy.nix
 
     # Removed
-    (mkRemovedOptionModule [ "flyingcircus" "roles" "graylog" "enable" ] "Last platform version that supported graylog/loghost was 22.05.")
-    (mkRemovedOptionModule [ "flyingcircus" "roles" "elasticsearch6" "enable" ] "Last platform version that supported elasticsearch6 was 22.11.")
-    (mkRemovedOptionModule [ "flyingcircus" "roles" "elasticsearch7" "enable" ] "Last platform version that supported elasticsearch7 was 22.11.")
-    (mkRemovedOptionModule [ "flyingcircus" "roles" "loghost" "enable" ] "Last platform version that supported graylog/loghost was 22.05.")
     (mkRemovedOptionModule [ "flyingcircus" "roles" "loghost-location" "enable" ] "Last platform version that supported graylog/loghost was 22.05.")
     (mkRemovedOptionModule [ "flyingcircus" "roles" "mysql" "rootPassword" ] "Change the root password via MySQL and modify secret files.")
     (mkRemovedOptionModule [ "flyingcircus" "roles" "statshostproxy" "enable" ] "Use flyingcircus.roles.statshost-location-proxy.enable instead.")