nixos/phoebus-olog: don't automatically enable elasticsearch

see #75, #54, follow-up of #60

(cherry picked from commit fb00ef9)

nixos/modules/phoebus/olog.nix

@@ -113,18 +113,8 @@ in {
         # TODO: systemd hardening. Currently level 8.2 EXPOSED
       };
     };
-
-    services.elasticsearch = {
-      enable = true;
-      # Should be kept in sync with the phoebus-alarm-logger and phoebus-save-and-restore services
-      package = pkgs.elasticsearch7;
-    };
     services.mongodb.enable = true;
   };
 
-  meta = {
-    maintainers = with epnixLib.maintainers; [minijackson];
-    # TODO:
-    # doc = ./olog.md;
-  };
+  meta.maintainers = with epnixLib.maintainers; [minijackson];
 }

nixos/tests/phoebus/olog.nix

@@ -7,12 +7,17 @@
   meta.maintainers = with epnixLib.maintainers; [minijackson];
 
   nodes = {
-    server = {
+    server = {pkgs, ...}: {
       services.phoebus-olog = {
         enable = true;
         settings."demo_auth.enabled" = true;
       };
 
+      services.elasticsearch = {
+        enable = true;
+        package = pkgs.elasticsearch7;
+      };
+
       nixpkgs.config.allowUnfreePredicate = pkg:
         builtins.elem (lib.getName pkg) [
           # Elasticsearch can be used as an SSPL-licensed software, which is