[DOCS] Updated links to the ES Ref for the X-Pack ref.

Original commit: elastic/x-pack-elasticsearch@d47f276678

docs/en/rest-api/xindex.asciidoc

@@ -3,116 +3,16 @@
 
 [partintro]
 --
-{xpack} exposes a wide range of REST APIs to manage and monitor its features.
+{xpack} exposes REST APIs that are used by the UI components and can be called
+directly to configure and access {xpack} features.
 
-* <<info-api, Info API>>
+* {ref}/info-api[Info API]
+* {ref}/graph-explore-api[Graph APIs]
 * <<security-api, Security APIs>>
-* {ref}/watcher-api.html[Watcher APIs]
-* <<graph-api, Graph APIs>>
 * {ref}/ml-apis.html[Machine Learning APIs]
 * {ref}/ml-api-definitions.html[Definitions]
+* {ref}/watcher-api.html[Watcher APIs]
+
 --
 
-[[info-api]]
-== Info API
-
-The info API provides general information on the installed {xpack}. This
-information includes:
-
-* Build Information - including the build number and timestamp.
-* License Information - basic information about the currently installed license.
-* Features Information - The features that are currently enabled and available
-  under the current license.
-
-The following example queries the info API:
-
-[source,js]
-------------------------------------------------------------
-GET /_xpack
-------------------------------------------------------------
-// CONSOLE
-
-Example response:
-[source,js]
-------------------------------------------------------------
-{
-   "build" : {
-      "hash" : "2798b1a3ce779b3611bb53a0082d4d741e4d3168",
-      "date" : "2015-04-07T13:34:42Z"
-   },
-   "license" : {
-      "uid" : "893361dc-9749-4997-93cb-802e3dofh7aa",
-      "type" : "trial",
-      "mode" : "trial",
-      "status" : "active",
-      "expiry_date_in_millis" : 1914278399999
-   },
-   "features" : {
-      "graph" : {
-         "description" : "Graph Data Exploration for the Elastic Stack",
-         "available" : true,
-         "enabled" : true
-      },
-      "logstash" : {
-         "description" : "Logstash management component for X-Pack",
-         "available" : true,
-         "enabled" : true
-      },
-      "ml" : {
-         "description" : "Machine Learning for the Elastic Stack",
-         "available" : true,
-         "enabled" : true,
-         "native_code_info" : {
-           "version" : "6.0.0-alpha1-SNAPSHOT",
-           "build_hash" : "d081461967d61a"
-        }
-      },
-      "monitoring" : {
-         "description" : "Monitoring for the Elastic Stack",
-         "available" : true,
-         "enabled" : true
-      },
-      "security" : {
-         "description" : "Security for the Elastic Stack",
-         "available" : true,
-         "enabled" : true
-      },
-      "watcher" : {
-         "description" : "Alerting, Notification and Automation for the Elastic Stack",
-         "available" : true,
-         "enabled" : true
-      }
-   },
-   "tagline" : "You know, for X"
-}
-------------------------------------------------------------
-// TESTRESPONSE[s/"hash" : "2798b1a3ce779b3611bb53a0082d4d741e4d3168",/"hash" : "$body.build.hash",/]
-// TESTRESPONSE[s/"date" : "2015-04-07T13:34:42Z"/"date" : "$body.build.date"/]
-// TESTRESPONSE[s/"uid" : "893361dc-9749-4997-93cb-802e3dofh7aa",/"uid": "$body.license.uid",/]
-// TESTRESPONSE[s/"expiry_date_in_millis" : 1914278399999/"expiry_date_in_millis" : "$body.license.expiry_date_in_millis"/]
-// TESTRESPONSE[s/"version" : "6.0.0-alpha1-SNAPSHOT",/"version": "$body.features.ml.native_code_info.version",/]
-// TESTRESPONSE[s/"build_hash" : "d081461967d61a"/"build_hash": "$body.features.ml.native_code_info.build_hash"/]
-// So much s/// but at least we test that the layout is close to matching....
-
-You can also control what information is returned using the `categories` and
-`human` parameters.
-
-The following example only returns the build and features information:
-
-[source,js]
-------------------------------------------------------------
-GET /_xpack?categories=build,features
-------------------------------------------------------------
-// CONSOLE
-
-The following example removes the descriptions from the response:
-
-[source,js]
-------------------------------------------------------------
-GET /_xpack?human=false
-------------------------------------------------------------
-// CONSOLE
-
 include::security.asciidoc[]
-
-include::graph.asciidoc[]