title: How to delete alll es index templates ? (Elasticserch 6.1.3)
body: <p>I try to delete all templates in my local instance .but it fail and I got this message .How do I delete all templates ?  I don't understand this error.</p>
  
  <p>My query :</p>
  
  <pre><code>DELETE /_template
  </code></pre>
  
  <p>error : </p>
  
  <pre><code>{
   "error": "Incorrect HTTP method for uri [/_template] and method [DELETE], allowed: [GET]",
  "status": 405}
  </code></pre>