title: _forcemerge in elasticsearch for large index not working
body: <p>Try to forcemerge index but always found response - {&quot;statusCode&quot;:502,&quot;error&quot;:&quot;Bad Gateway&quot;,&quot;message&quot;:&quot;Client request timeout&quot;}
  <code>POST index_name/_forcemerge?only_expunge_deletes=true&amp;max_num_segments=1</code></p>