Connnection unsuccessful to elasticsearch on localhost .

[coolb0y]

I used the sandbox code https://codesandbox.io/s/0yn05 . I put my index name as app name and credentials I put which I created during elasticsearch installation "elastic:somepassword" format and also link I gave was https://localhost:9200 . After setting all the cors setting in elasticsearch.yml . I found this error console
{"type":"default","status":400,"ok":false,"statusText":"Bad Request","headers":{"map":{"content-length":"88","content-type":"application/json"}},"url":"https://localhost:9200/dataserver/_reactivesearch.v3","_bodyInit":{},"_bodyBlob":{},"bodyUsed":true}
Please help me .