(temporary) try to restore legacy plugin to check behavior

src/legacy/core_plugins/status_page/index.js

@@ -0,0 +1,31 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+export default function (kibana) {
+  return new kibana.Plugin({
+    uiExports: {
+      app: {
+        title: 'Old Server Status',
+        main: 'plugins/status_page/status_page',
+        hidden: true,
+        url: '/old-status',
+      },
+    },
+  });
+}

src/legacy/core_plugins/status_page/package.json

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+{
+  "name": "status_page",
+  "version": "kibana"
+}

src/legacy/core_plugins/status_page/public/components/render.js

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+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import React from 'react';
+import { render, unmountComponentAtNode } from 'react-dom';
+import { I18nContext } from 'ui/i18n';
+// just to import eui into legacy
+import '@elastic/eui';
+
+const STATUS_PAGE_DOM_NODE_ID = 'createStatusPageReact';
+
+export function renderStatusPage() {
+  const node = document.getElementById(STATUS_PAGE_DOM_NODE_ID);
+
+  if (!node) {
+    return;
+  }
+
+  render(<I18nContext>Foo</I18nContext>, node);
+}
+
+export function destroyStatusPage() {
+  const node = document.getElementById(STATUS_PAGE_DOM_NODE_ID);
+  node && unmountComponentAtNode(node);
+}

src/legacy/core_plugins/status_page/public/status_page.html

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+<div id="createStatusPageReact"></div>

src/legacy/core_plugins/status_page/public/status_page.js

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+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import 'ui/i18n';
+import chrome from 'ui/chrome';
+import { npStart } from 'ui/new_platform';
+import { destroyStatusPage, renderStatusPage } from './components/render';
+import template from 'plugins/status_page/status_page.html';
+
+npStart.core.chrome.navLinks.enableForcedAppSwitcherNavigation();
+
+chrome.setRootTemplate(template).setRootController('ui', function ($scope, buildNum, buildSha) {
+  $scope.$$postDigest(() => {
+    renderStatusPage(buildNum, buildSha.substr(0, 8));
+    $scope.$on('$destroy', destroyStatusPage);
+  });
+});