EXCEPTION: Promise is not a constructor in v12.0.0-rc5

I am trying to get this working with an angular2 application. I am importing this (elasticsearch.js) into my component and then:

var connectionString = 'xyz';
this._client = new elasticsearch.Client({ host: connectionString, log: 'trace' });

ngOnInit() {
    console.log('NGINIT');
    /*this._client.search({
      index: 'twitter',
      type: 'tweets',
      body: {
        query: {
          match: {
            body: 'elasticsearch'
          }
        }
      }
    }).then(function (resp) {
      var hits = resp.hits.hits;
    }, function (err) {
      console.trace(err.message);
    });
*/

  }

so in my console I get:

DEBUG: 2016-10-02T12:09:56Z starting request { “method”: “POST”, “path”: “/plugins/document/_search”, “body”: { “query”: { “query_string”: { “query”: “Bluetooth” } } }, “query”: {} }

and then when I uncomment the this._client.search({ section, I get:

EXCEPTION: Promise is not a constructor

client.ping({ ...})

works as expected. and the issue goes away if I use v.11.0.1 rather than v.12.0.0-rc5

[kmulvey]

totally works now, thanks

[spalger]

Apologies, I accidentally ignored the promise polyfill in the vanilla browser build. Fixed in 12.1.3, which I just published.