title: ElasticSearch Script Field return incorrect value
body: <p>I have a document with <code>cd</code> field is 44.4
  When i using "script_fields as below : </p>
  
  <pre><code>"doc['cd'].value + 1"
  </code></pre>
  
  <p><code>script_fields</code> value will return <code>45.400001525878906</code></p>
  
  <p>Please help me to use <code>script_fields</code> value return to <code>45.4</code></p>