Add xpack info and usage endpoints for runtime fields (#65600)

Relates to #59332

Author: javanna

docs/reference/rest-api/info.asciidoc

@@ -107,6 +107,10 @@ Example response:
          "available": true,
          "enabled": true
       },
+      "runtime_fields": {
+         "available": true,
+         "enabled": true
+      },
       "searchable_snapshots" : {
          "available" : true,
          "enabled" : true

docs/reference/rest-api/usage.asciidoc

@@ -341,6 +341,11 @@ GET /_xpack/usage
   "aggregate_metric" : {
     "available" : true,
     "enabled" : true
+  },
+  "runtime_fields" : {
+    "available" : true,
+    "enabled" : true,
+    "field_types" : []
   }
 }
 ------------------------------------------------------------

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/XPackClientPlugin.java

@@ -151,11 +151,12 @@
 import org.elasticsearch.xpack.core.rollup.action.GetRollupJobsAction;
 import org.elasticsearch.xpack.core.rollup.action.PutRollupJobAction;
 import org.elasticsearch.xpack.core.rollup.action.RollupSearchAction;
-import org.elasticsearch.xpack.core.rollup.v2.RollupAction;
 import org.elasticsearch.xpack.core.rollup.action.StartRollupJobAction;
 import org.elasticsearch.xpack.core.rollup.action.StopRollupJobAction;
 import org.elasticsearch.xpack.core.rollup.job.RollupJob;
 import org.elasticsearch.xpack.core.rollup.job.RollupJobStatus;
+import org.elasticsearch.xpack.core.rollup.v2.RollupAction;
+import org.elasticsearch.xpack.core.runtimefields.RuntimeFieldsFeatureSetUsage;
 import org.elasticsearch.xpack.core.search.action.GetAsyncSearchAction;
 import org.elasticsearch.xpack.core.search.action.SubmitAsyncSearchAction;
 import org.elasticsearch.xpack.core.searchablesnapshots.SearchableSnapshotFeatureSetUsage;
@@ -522,7 +523,8 @@ public List<NamedWriteableRegistry.Entry> getNamedWriteables() {
             // Data Streams
             new NamedWriteableRegistry.Entry(XPackFeatureSet.Usage.class, XPackField.DATA_STREAMS, DataStreamFeatureSetUsage::new),
             // Data Tiers
-            new NamedWriteableRegistry.Entry(XPackFeatureSet.Usage.class, XPackField.DATA_TIERS, DataTiersFeatureSetUsage::new)
+            new NamedWriteableRegistry.Entry(XPackFeatureSet.Usage.class, XPackField.DATA_TIERS, DataTiersFeatureSetUsage::new),
+            new NamedWriteableRegistry.Entry(XPackFeatureSet.Usage.class, XPackField.RUNTIME_FIELDS, RuntimeFieldsFeatureSetUsage::new)
         );
     }
 

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/XPackField.java

@@ -67,6 +67,8 @@ public final class XPackField {
     public static final String DATA_TIERS = "data_tiers";
     /** Name constant for the aggregate_metric plugin. */
     public static final String AGGREGATE_METRIC = "aggregate_metric";
+    /** Name constant for the runtime fields plugin. */
+    public static final String RUNTIME_FIELDS = "runtime_fields";
     /** Name constant for the operator privileges feature. */
     public static final String OPERATOR_PRIVILEGES = "operator_privileges";
 

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/action/XPackInfoFeatureAction.java

@@ -47,14 +47,15 @@ public class XPackInfoFeatureAction extends ActionType<XPackInfoFeatureResponse>
     public static final XPackInfoFeatureAction DATA_STREAMS = new XPackInfoFeatureAction(XPackField.DATA_STREAMS);
     public static final XPackInfoFeatureAction DATA_TIERS = new XPackInfoFeatureAction(XPackField.DATA_TIERS);
     public static final XPackInfoFeatureAction AGGREGATE_METRIC = new XPackInfoFeatureAction(XPackField.AGGREGATE_METRIC);
+    public static final XPackInfoFeatureAction RUNTIME_FIELDS = new XPackInfoFeatureAction(XPackField.RUNTIME_FIELDS);
 
     public static final List<XPackInfoFeatureAction> ALL;
     static {
         final List<XPackInfoFeatureAction> actions = new ArrayList<>();
         actions.addAll(Arrays.asList(
             SECURITY, MONITORING, WATCHER, GRAPH, MACHINE_LEARNING, LOGSTASH, EQL, SQL, ROLLUP, INDEX_LIFECYCLE, SNAPSHOT_LIFECYCLE, CCR,
             TRANSFORM, VECTORS, VOTING_ONLY, FROZEN_INDICES, SPATIAL, ANALYTICS, ENRICH, DATA_STREAMS, SEARCHABLE_SNAPSHOTS, DATA_TIERS,
-            AGGREGATE_METRIC
+            AGGREGATE_METRIC, RUNTIME_FIELDS
         ));
         ALL = Collections.unmodifiableList(actions);
     }

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/action/XPackUsageFeatureAction.java

@@ -8,9 +8,6 @@
 import org.elasticsearch.action.ActionType;
 import org.elasticsearch.xpack.core.XPackField;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 
 /**
@@ -47,17 +44,33 @@ public class XPackUsageFeatureAction extends ActionType<XPackUsageFeatureRespons
     public static final XPackUsageFeatureAction DATA_STREAMS = new XPackUsageFeatureAction(XPackField.DATA_STREAMS);
     public static final XPackUsageFeatureAction DATA_TIERS = new XPackUsageFeatureAction(XPackField.DATA_TIERS);
     public static final XPackUsageFeatureAction AGGREGATE_METRIC = new XPackUsageFeatureAction(XPackField.AGGREGATE_METRIC);
+    public static final XPackUsageFeatureAction RUNTIME_FIELDS = new XPackUsageFeatureAction(XPackField.RUNTIME_FIELDS);
 
-    public static final List<XPackUsageFeatureAction> ALL;
-    static {
-        final List<XPackUsageFeatureAction> actions = new ArrayList<>();
-        actions.addAll(Arrays.asList(
-            SECURITY, MONITORING, WATCHER, GRAPH, MACHINE_LEARNING, LOGSTASH, EQL, SQL, ROLLUP, INDEX_LIFECYCLE, SNAPSHOT_LIFECYCLE, CCR,
-            TRANSFORM, VECTORS, VOTING_ONLY, FROZEN_INDICES, SPATIAL, ANALYTICS, DATA_STREAMS, SEARCHABLE_SNAPSHOTS, DATA_TIERS,
-            AGGREGATE_METRIC
-        ));
-        ALL = Collections.unmodifiableList(actions);
-    }
+    static final List<XPackUsageFeatureAction> ALL = List.of(
+        AGGREGATE_METRIC,
+        ANALYTICS,
+        CCR,
+        DATA_STREAMS,
+        DATA_TIERS,
+        EQL,
+        FROZEN_INDICES,
+        GRAPH,
+        INDEX_LIFECYCLE,
+        LOGSTASH,
+        MACHINE_LEARNING,
+        MONITORING,
+        ROLLUP,
+        RUNTIME_FIELDS,
+        SEARCHABLE_SNAPSHOTS,
+        SECURITY,
+        SNAPSHOT_LIFECYCLE,
+        SPATIAL,
+        SQL,
+        TRANSFORM,
+        VECTORS,
+        VOTING_ONLY,
+        WATCHER
+    );
 
     private XPackUsageFeatureAction(String name) {
         super(BASE_NAME + name, XPackUsageFeatureResponse::new);