Changed the default output of X-Pack Info API

- by default the response includes all info - build, license, features + human descriptions.
- you can still control the output using `categories` and `human` parameters
- Added docs to this API

Original commit: elastic/x-pack-elasticsearch@85115495ec

elasticsearch/x-pack/src/main/java/org/elasticsearch/xpack/action/XPackInfoRequest.java

@@ -25,8 +25,15 @@ public class XPackInfoRequest extends ActionRequest<XPackInfoRequest> {
         public static EnumSet<Category> toSet(String... categories) {
             EnumSet<Category> set = EnumSet.noneOf(Category.class);
             for (String category : categories) {
+                switch (category) {
+                    case "_all":
+                        return EnumSet.allOf(Category.class);
+                    case "_none":
+                        return EnumSet.noneOf(Category.class);
+                    default:
                         set.add(Category.valueOf(category.toUpperCase(Locale.ROOT)));
                 }
+            }
             return set;
         }
     }

elasticsearch/x-pack/src/main/java/org/elasticsearch/xpack/rest/action/RestXPackInfoAction.java

@@ -6,7 +6,6 @@
 package org.elasticsearch.xpack.rest.action;
 
 import org.elasticsearch.client.Client;
-import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentBuilder;
@@ -40,10 +39,10 @@ public class RestXPackInfoAction extends XPackRestHandler {
     protected void handleRequest(RestRequest request, RestChannel restChannel, XPackClient client) throws Exception {
 
         // we piggyback verbosity on "human" output
-        boolean verbose = request.paramAsBoolean("human", false);
+        boolean verbose = request.paramAsBoolean("human", true);
 
         EnumSet<XPackInfoRequest.Category> categories = XPackInfoRequest.Category
-                .toSet(request.paramAsStringArray("categories", Strings.EMPTY_ARRAY));
+                .toSet(request.paramAsStringArray("categories", new String[] { "_all" }));
         client.prepareInfo().setVerbose(verbose).setCategories(categories).execute(new RestBuilderListener<XPackInfoResponse>(restChannel) {
             @Override
             public RestResponse buildResponse(XPackInfoResponse infoResponse, XContentBuilder builder) throws Exception {

elasticsearch/x-pack/src/test/resources/rest-api-spec/test/xpack/15_basic.yaml

@@ -56,24 +56,6 @@
 
   - do:
       xpack.info: {}
-  - is_false:    tagline
-  - is_false:    build
-  - is_false:    features
-  - is_false:    license
-
-  - do:
-      xpack.info:
-        categories: "build"
-  - is_true:   build
-  - is_true:    build.hash
-  - is_true:    build.timestamp
-  - is_false:   tagline
-  - is_false:   features
-  - is_false:   license
-
-  - do:
-      xpack.info:
-        categories: "build,license"
   - is_true:    build.hash
   - is_true:    build.timestamp
   - is_true:    license
@@ -82,12 +64,71 @@
   - match: { license.mode: "platinum" }
   - match: { license.status: "active" }
   - match: { license.expiry_date_in_millis: 1914278399999 }
-  - is_false:   tagline
+  - is_true:    features
+  - is_true:    features.watcher
+  - is_true:    features.watcher.enabled
+  - is_true:    features.watcher.available
+  - is_true:    features.watcher.description
+  - is_true:    features.security
+  - is_true:    features.security.enabled
+  - is_true:    features.security.available
+  - is_true:    features.security.description
+  - is_true:    features.graph
+  - is_true:    features.graph.enabled
+  - is_true:    features.graph.available
+  - is_true:    features.graph.description
+  - is_true:    features.monitoring
+  - is_true:    features.monitoring.enabled
+  - is_true:    features.monitoring.available
+  - is_true:    features.monitoring.description
+  - is_true:    tagline
+
+  - do:
+    xpack.info:
+      categories: "_none"
+  - is_false:    build
   - is_false:    features
+  - is_false:    license
+  - match: { tagline: "You know, for X" }
+
+  - do:
+    xpack.info:
+      categories: "_none"
+      human: false
+  - is_false:    build
+  - is_false:    features
+  - is_false:    license
+  - is_false:    tagline
+
+  - do:
+      xpack.info:
+        categories: "build"
+  - is_true:   build
+  - is_true:    build.hash
+  - is_true:    build.timestamp
+  - is_true:    tagline
+  - is_false:   features
+  - is_false:   license
+
+  - do:
+      xpack.info:
+        categories: "build,license"
+  - is_true:    build.hash
+  - is_true:    build.timestamp
+  - is_true:    tagline
+  - is_false:   features
+  - is_true:    license
+  - match: { license.uid: "893361dc-9749-4997-93cb-802e3dofh7aa" }
+  - match: { license.type: "internal" }
+  - match: { license.mode: "platinum" }
+  - match: { license.status: "active" }
+  - match: { license.expiry_date_in_millis: 1914278399999 }
+
 
   - do:
       xpack.info:
         categories: "build,license,features"
+        human: false
   - is_true:    build.hash
   - is_true:    build.timestamp
   - is_true:    license
@@ -115,33 +156,4 @@
   - is_false:   features.monitoring.description
   - is_false:   tagline
 
-  - do:
+
-      xpack.info:
-        categories: "build,license,features"
-        human: "true"
-  - is_true:    build.hash
-  - is_true:    build.timestamp
-  - is_true:    license
-  - match: { license.uid: "893361dc-9749-4997-93cb-802e3dofh7aa" }
-  - match: { license.type: "internal" }
-  - match: { license.mode: "platinum" }
-  - match: { license.status: "active" }
-  - match: { license.expiry_date_in_millis: 1914278399999 }
-  - is_true:    features
-  - is_true:    features.watcher
-  - is_true:    features.watcher.enabled
-  - is_true:    features.watcher.available
-  - is_true:    features.watcher.description
-  - is_true:    features.security
-  - is_true:    features.security.enabled
-  - is_true:    features.security.available
-  - is_true:    features.security.description
-  - is_true:    features.graph
-  - is_true:    features.graph.enabled
-  - is_true:    features.graph.available
-  - is_true:    features.graph.description
-  - is_true:    features.monitoring
-  - is_true:    features.monitoring.enabled
-  - is_true:    features.monitoring.available
-  - is_true:    features.monitoring.description
-  - is_true:    tagline