Verify connection to Elasticsearch (#1487) (#1497)

Co-authored-by: Tomas Della Vedova <delvedor@users.noreply.github.com>

test/utils/index.js

@@ -25,6 +25,7 @@ const buildServer = require('./buildServer')
 const buildCluster = require('./buildCluster')
 const buildProxy = require('./buildProxy')
 const connection = require('./MockConnection')
+const { Client } = require('../../')
 
 async function waitCluster (client, waitForStatus = 'green', timeout = '50s', times = 0) {
   if (!client) {
@@ -41,10 +42,25 @@ async function waitCluster (client, waitForStatus = 'green', timeout = '50s', ti
   }
 }
 
+function skipProductCheck (client) {
+  const tSymbol = Object.getOwnPropertySymbols(client.transport || client)
+    .filter(symbol => symbol.description === 'product check')[0]
+  ;(client.transport || client)[tSymbol] = 2
+}
+
+class NoProductCheckClient extends Client {
+  constructor (opts) {
+    super(opts)
+    skipProductCheck(this)
+  }
+}
+
 module.exports = {
   buildServer,
   buildCluster,
   buildProxy,
   connection,
-  waitCluster
+  waitCluster,
+  skipProductCheck,
+  Client: NoProductCheckClient
 }