Elasticsearch Jasvascript API Query size problems

Hello, I'm doing the following query to elasticsearch using the JS API:

client.search({
  index: 'winlogbeat-2017.05.19',
  size : 50,
  body : {
    query : { 
    	match : {  tags : "example-tag" } 
    }
  }
}).then(function (body) {
  ...
 }

There are only 26 registers with the tag "example-tag", but Elasticsearch returns 50 results, the first 26th are with the "example-tag" tag, and the rest are results of the same index, in the correct timestamp order but without the "example-tag" tag.

How can I only retrieve results with the "example-tag" tag?

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