Add missing 'type', 'defaultText' and 'literalExample' in module definitions

- add missing types in module definitions
- add missing 'defaultText' in module definitions
- wrap example with 'literalExample' where necessary in module definitions

nixos/modules/services/search/elasticsearch.nix

@@ -40,6 +40,7 @@ in {
     package = mkOption {
       description = "Elasticsearch package to use.";
       default = pkgs.elasticsearch;
+      defaultText = "pkgs.elasticsearch";
       type = types.package;
     };
 

nixos/modules/services/search/kibana.nix

@@ -127,6 +127,7 @@ in {
     package = mkOption {
       description = "Kibana package to use";
       default = pkgs.kibana;
+      defaultText = "pkgs.kibana";
       type = types.package;
     };
 

nixos/modules/services/search/solr.nix

@@ -45,6 +45,7 @@ in {
       javaPackage = mkOption {
         type = types.package;
         default = pkgs.jre;
+        defaultText = "pkgs.jre";
         description = ''
           Which Java derivation to use for running solr.
         '';
@@ -53,6 +54,7 @@ in {
       solrPackage = mkOption {
         type = types.package;
         default = pkgs.solr;
+        defaultText = "pkgs.solr";
         description = ''
           Which solr derivation to use for running solr.
         '';