title: Null object returned for RollingFile in Appenders
body: <pre><code>mai 01 23:27:15 Akira elasticsearch[26881]:         at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)
  mai 01 23:27:15 Akira elasticsearch[26881]:         at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85)
  mai 01 23:27:15 Akira elasticsearch[26881]: 2018-05-01 23:27:15,572 main ERROR Null object returned for RollingFile in Appenders.
  mai 01 23:27:15 Akira elasticsearch[26881]: 2018-05-01 23:27:15,573 main ERROR Null object returned for RollingFile in Appenders.
  mai 01 23:27:15 Akira elasticsearch[26881]: 2018-05-01 23:27:15,574 main ERROR Unable to locate appender "rolling" for logger config "root"
  mai 01 23:27:15 Akira elasticsearch[26881]: 2018-05-01 23:27:15,574 main ERROR Unable to locate appender "index_indexing_slowlog_rolling" for logger config "index.indexing.slowlog.i
  mai 01 23:27:15 Akira elasticsearch[26881]: 2018-05-01 23:27:15,575 main ERROR Unable to locate appender "index_search_slowlog_rolling" for logger config "index.search.slowlog"
  mai 01 23:27:15 Akira elasticsearch[26881]: 2018-05-01 23:27:15,575 main ERROR Unable to locate appender "deprecation_rolling" for logger config "org.elasticsearch.deprecation"
  mai 01 23:27:15 Akira systemd[1]: elasticsearch.service: Main process exited, code=exited, status=1/FAILURE
  mai 01 23:27:15 Akira systemd[1]: elasticsearch.service: Failed with result 'exit-code'.
  </code></pre>
  
  <p>How can I fix it, I was try to start Elastic Search and I receive this message. I'm in Ubuntu Budgie 18.04, Elastic Search 1.51, installed by a <code>.deb</code>, and Java 1.8.0. I researched : <a href="https://discuss.elastic.co/t/log4j-errors-when-starting-es/64484" rel="noreferrer">Log errors when starting Es</a>, <a href="https://discuss.elastic.co/t/elasticsearch-doesnt-start-and-there-is-no-log/88055" rel="noreferrer">Es doesn’t start and there is no log</a> ... but nothing worked.</p>