Move non duplicated actions back into xpack core (#32952)

Most actions' request and response were moved from xpack core into
protocol. We have decided to instead duplicate the actions in the HLRC
instead of trying to reuse them. This commit moves the non duplicated
actions back into xpack core and severs the tie between xpack core and
protocol so no other actions can be moved and not duplicated.

x-pack/plugin/core/build.gradle

@@ -8,7 +8,6 @@ import java.nio.file.StandardCopyOption
 apply plugin: 'elasticsearch.esplugin'
 apply plugin: 'nebula.maven-base-publish'
 apply plugin: 'nebula.maven-scm'
-apply plugin: 'com.github.johnrengelman.shadow'
 
 archivesBaseName = 'x-pack-core'
 
@@ -27,7 +26,6 @@ dependencyLicenses {
 
 dependencies {
     compileOnly "org.elasticsearch:elasticsearch:${version}"
-    bundle project(':x-pack:protocol')
     compile "org.apache.httpcomponents:httpclient:${versions.httpclient}"
     compile "org.apache.httpcomponents:httpcore:${versions.httpcore}"
     compile "org.apache.httpcomponents:httpcore-nio:${versions.httpcore}"
@@ -112,8 +110,7 @@ test {
 // TODO: don't publish test artifacts just to run messy tests, fix the tests!
 // https://github.com/elastic/x-plugins/issues/724
 configurations {
-    testArtifacts.extendsFrom(testRuntime, shadow)
-    testArtifacts.exclude(group: project(':x-pack:protocol').group, module: project(':x-pack:protocol').name)
+    testArtifacts.extendsFrom testRuntime
 }
 task testJar(type: Jar) {
     appendix 'test'
@@ -122,7 +119,7 @@ task testJar(type: Jar) {
 
 artifacts {
     // normal es plugins do not publish the jar but we need to since users need it for Transport Clients and extensions
-    archives shadowJar
+    archives jar
     testArtifacts testJar
 }
 

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

@@ -0,0 +1,86 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.protocol.xpack;
+
+import org.elasticsearch.action.ActionRequest;
+import org.elasticsearch.action.ActionRequestValidationException;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+
+import java.io.IOException;
+import java.util.EnumSet;
+import java.util.Locale;
+
+/**
+ * Fetch information about X-Pack from the cluster.
+ */
+public class XPackInfoRequest extends ActionRequest {
+
+    public enum Category {
+        BUILD, LICENSE, FEATURES;
+
+        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;
+        }
+    }
+
+    private boolean verbose;
+    private EnumSet<Category> categories = EnumSet.noneOf(Category.class);
+
+    public XPackInfoRequest() {}
+
+    public void setVerbose(boolean verbose) {
+        this.verbose = verbose;
+    }
+
+    public boolean isVerbose() {
+        return verbose;
+    }
+
+    public void setCategories(EnumSet<Category> categories) {
+        this.categories = categories;
+    }
+
+    public EnumSet<Category> getCategories() {
+        return categories;
+    }
+
+    @Override
+    public ActionRequestValidationException validate() {
+        return null;
+    }
+
+    @Override
+    public void readFrom(StreamInput in) throws IOException {
+        this.verbose = in.readBoolean();
+        EnumSet<Category> categories = EnumSet.noneOf(Category.class);
+        int size = in.readVInt();
+        for (int i = 0; i < size; i++) {
+            categories.add(Category.valueOf(in.readString()));
+        }
+        this.categories = categories;
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        out.writeBoolean(verbose);
+        out.writeVInt(categories.size());
+        for (Category category : categories) {
+            out.writeString(category.name());
+        }
+    }
+}