title: Installation of kopf plugin for elasticsearch 5.1.1?
body: <p>Actually i have elasticsearch 5.1.1 and tried downloading kopf plugin with the following commands and i got a error like this ..Can u help me in solving this problem?? </p>
  
  <p>C:\Users\896323\Downloads\elasticsearch-5.1.1\elasticsearch-5.1.1\bin>plugin install lmenezes/elasticsearch-kopf/2.1.1
  A tool for managing installed elasticsearch plugins</p>
  
  <h2>Commands</h2>
  
  <ul>
  <li>list - Lists installed elasticsearch plugins</li>
  <li>install - Install a plugin</li>
  <li>remove - Removes a plugin from elasticsearch</li>
  </ul>
  
  <p>Non-option arguments:
  command</p>
  
  <p>Option         Description
  ------         -----------</p>
  
  <ul>
  <li>-h, --help     show help</li>
  <li>-s, --silent   show minimal output</li>
  <li>-v, --verbose  show verbose output</li>
  </ul>
  
  <blockquote>
    <p>ERROR: Unknown plugin lmenezes/elasticsearch-kopf/2.1.1</p>
  </blockquote>