Add healtcheck middleware

src/index.js

@@ -79,6 +79,10 @@ const applyConfig = (config) => {
     middleware.all('**/_es/*', handler);
     middleware.id = 'esProxyMiddleware';
 
+    const healthCheckMiddleware = require('./middleware/healthcheck').default;
+    middleware.all('**/_es_healthcheck/:id', healthCheckMiddleware);
+    middleware.id = 'esHealthcheck';
+
     config.settings.expressMiddleware = [
       ...config.settings.expressMiddleware,
       middleware,

src/middleware/healthcheck.js

@@ -0,0 +1,16 @@
+import { registry } from '@eeacms/search';
+
+export default function healthcheck(req, res, next) {
+  const { id } = req.params;
+  const appConfig = registry.searchui[id];
+  if (appConfig.healthcheck) {
+    appConfig
+      .healthcheck(appConfig)
+      .then((body) => res.send(body))
+      .catch((body) => {
+        res.send({ error: body });
+      });
+  } else {
+    next();
+  }
+}