add index creation to init tasks

src/index.js

@@ -1,5 +1,7 @@
 import events from 'events';
-import createClient from './helpers/create_client';
+import createClient from './helpers/es_client';
+import indexTimestamp from './helpers/index_timestamp';
+import createIndex from './helpers/create_index';
 import Job from './job.js';
 import Worker from './worker.js';
 import { omit } from 'lodash';
@@ -11,10 +13,21 @@ export default class Elastique extends events.EventEmitter {
     super();
     this.index = index;
     this.settings = Object.assign({
-      interval: '1w',
+      interval: 'week',
       timeout: 10000,
     }, omit(options, [ 'client' ]));
     this.client = createClient(options.client || {});
+
+    this._initTasks().catch((err) => this.emit('error', err));
+  }
+
+  _initTasks() {
+    const timestamp = indexTimestamp(this.settings.interval);
+    var initTasks = [
+      this.client.ping({ timeout: 3000 }),
+      createIndex(this.client, `${this.index}-${timestamp}`),
+    ];
+    return Promise.all(initTasks);
   }
 
   add(type, payload, opts = {}) {