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<p>
  <strong>WARNING</strong>: This documentation covers Elasticsearch 2.x. The 2.x
  versions of Elasticsearch have passed their
  <a href="https://www.elastic.co/support/eol">EOL dates</a>. If you are running
  a 2.x version, we strongly advise you to upgrade.
</p>
<p>
  This documentation is no longer maintained and may be removed. For the latest
  information, see the <a
  href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html">current
  Elasticsearch documentation</a>.
</p>