React app + get no results / Network error


I begin to use ElasticSearch, and I need to build a React App to get datas from an index. For this, I use a basic request to call my index :

    axios.get(url, {
      auth: {
        username: 'elastic',
        password: 'XXXXXXXXXXXXXXXXX'
   .then(results => {
 .catch(error => {

But, I get no results / or a Network error. I get the same problem with a fetch function.
With other APIs I get some results without problem.

Is there a possibility that the problem come from the CORS? Or from a mistake in my request?

Thanks for your help.

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