Update plugin-related output in reference docs (#25897)

The example output for node info and cluster stats was outdated w.r.t.
to the information that is shown for plugins. With this commit we
updated the example output and update the explanation of the respective
fields.

docs/reference/cluster/nodes-info.asciidoc

@@ -113,45 +113,46 @@ the current running process:
 [[plugins-info]]
 ==== Plugins information
 
-`plugins` - if set, the result will contain details about the loaded
-plugins per node:
+`plugins` - if set, the result will contain details about the installed plugins
+ per node:
 
 * `name`: plugin name
-* `description`: plugin description if any
-* `site`: `true` if the plugin is a site plugin
-* `jvm`: `true` if the plugin is a plugin running in the JVM
-* `url`: URL if the plugin is a site plugin
+* `version`: version of Elasticsearch the plugin was built for
+* `description`: short description of the plugin's purpose
+* `classname`: fully-qualified class name of the plugin's entry point
+* `has_native_controller`: whether or not the plugin has a native controller process
 
 The result will look similar to:
 
 [source,js]
 --------------------------------------------------
 {
-  "cluster_name" : "test-cluster-MacBook-Air-de-David.local",
-  "nodes" : {
-    "hJLXmY_NTrCytiIMbX4_1g" : {
-      "name" : "node4",
-      "transport_address" : "inet[/172.18.58.139:9303]",
-      "hostname" : "MacBook-Air-de-David.local",
-      "version" : "0.90.0.Beta2-SNAPSHOT",
-      "http_address" : "inet[/172.18.58.139:9203]",
-      "plugins" : [ {
-        "name" : "test-plugin",
-        "description" : "test-plugin description",
-        "site" : true,
-        "jvm" : false
-      }, {
-        "name" : "test-no-version-plugin",
-        "description" : "test-no-version-plugin description",
-        "site" : true,
-        "jvm" : false
-      }, {
-        "name" : "dummy",
-        "description" : "No description found for dummy.",
-        "url" : "/_plugin/dummy/",
-        "site" : false,
-        "jvm" : true
-      } ]
+  "cluster_name": "elasticsearch",
+  "nodes": {
+    "O70_wBv6S9aPPcAKdSUBtw": {
+      "plugins": [
+        {
+          "name": "analysis-icu",
+          "version": "{version}",
+          "description": "The ICU Analysis plugin integrates Lucene ICU module into elasticsearch, adding ICU relates analysis components.",
+          "classname": "org.elasticsearch.plugin.analysis.icu.AnalysisICUPlugin",
+          "has_native_controller": false
+        },
+        {
+          "name": "ingest-geoip",
+          "version": "{version}",
+          "description": "Ingest processor that uses looksup geo data based on ip adresses using the Maxmind geo database",
+          "classname": "org.elasticsearch.ingest.geoip.IngestGeoIpPlugin",
+          "has_native_controller": false
+        },
+        {
+          "name": "ingest-user-agent",
+          "version": "{version}",
+          "description": "Ingest processor that extracts information from a user agent",
+          "classname": "org.elasticsearch.ingest.useragent.IngestUserAgentPlugin",
+          "has_native_controller": false
+        }
+      ]
     }
   }
 }

docs/reference/cluster/stats.asciidoc

@@ -167,13 +167,27 @@ Will return, for example:
          "available_in_bytes": 34802409472
       },
       "plugins": [
-         // all plugins installed on nodes
-         {
-            "name": "analysis-stempel",
-            "version": "{version}",
-            "description": "The Stempel (Polish) Analysis plugin integrates Lucene stempel (polish) analysis module into elasticsearch.",
-            "classname": "org.elasticsearch.plugin.analysis.stempel.AnalysisStempelPlugin"
-         }
+        {
+          "name": "analysis-icu",
+          "version": "{version}",
+          "description": "The ICU Analysis plugin integrates Lucene ICU module into elasticsearch, adding ICU relates analysis components.",
+          "classname": "org.elasticsearch.plugin.analysis.icu.AnalysisICUPlugin",
+          "has_native_controller": false
+        },
+        {
+          "name": "ingest-geoip",
+          "version": "{version}",
+          "description": "Ingest processor that uses looksup geo data based on ip adresses using the Maxmind geo database",
+          "classname": "org.elasticsearch.ingest.geoip.IngestGeoIpPlugin",
+          "has_native_controller": false
+        },
+        {
+          "name": "ingest-user-agent",
+          "version": "{version}",
+          "description": "Ingest processor that extracts information from a user agent",
+          "classname": "org.elasticsearch.ingest.useragent.IngestUserAgentPlugin",
+          "has_native_controller": false
+        }
       ]
    }
 }