elasticsearch: Install elastic search modules properly, fixes groovy script support.

nixos/modules/services/search/elasticsearch.nix

@@ -145,6 +145,7 @@ in {
         # Install plugins
         ln -sfT ${esPlugins}/plugins ${cfg.dataDir}/plugins
         ln -sfT ${cfg.package}/lib ${cfg.dataDir}/lib
+        ln -sfT ${cfg.package}/modules ${cfg.dataDir}/modules
         if [ "$(id -u)" = 0 ]; then chown -R elasticsearch ${cfg.dataDir}; fi
       '';
       postStart = mkBefore ''

pkgs/servers/search/elasticsearch/2.x.nix

@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
 
   installPhase = ''
     mkdir -p $out
-    cp -R bin config lib $out
+    cp -R bin config lib modules $out
 
     # don't want to have binary with name plugin
     mv $out/bin/plugin $out/bin/elasticsearch-plugin