What is the default user and password for elasticsearch? : <p>I have <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html" rel="noreferrer">installed Elastic with Docker</a>:</p>

<pre><code>docker run -p 9200:9200 \
           -p 9300:9300 \
           -e "discovery.type=single-node" \ 
           docker.elastic.co/elasticsearch/elasticsearch:5.6.2
</code></pre>

<p>But <code>curl localhost:9200</code> fails with authentication error:</p>

<pre><code>{
  "error": {
    "root_cause": [
      {
        "type": "security_exception",
        "reason": "missing authentication token for REST request [/]",
        "header": {
          "WWW-Authenticate": "Basic realm=\"security\" charset=\"UTF-8\""
        }
      }
    ],
    "type": "security_exception",
    "reason": "missing authentication token for REST request [/]",
    "header": {
      "WWW-Authenticate": "Basic realm=\"security\" charset=\"UTF-8\""
    }
  },
  "status": 401
}
</code></pre>

<p><strong>What is the default username/password combo for Elasticsearch?</strong></p>
