title: Logstash start with error: Pipelines YAML file is empty
body: <p>When I try start logstash server on my machine I get this error:</p>
  
  <pre><code>Sending Logstash's logs to D:/kibana/logstash-6.3.2/logs which is now configured
       via log4j2.properties
      ERROR: Pipelines YAML file is empty. Location: D:/kibana/logstash-6.3.2/config/p
      ipelines.yml
      usage:
        bin/logstash -f CONFIG_PATH [-t] [-r] [] [-w COUNT] [-l LOG]
        bin/logstash --modules MODULE_NAME [-M "MODULE_NAME.var.PLUGIN_TYPE.PLUGIN_NAM
      E.VARIABLE_NAME=VALUE"] [-t] [-w COUNT] [-l LOG]
        bin/logstash -e CONFIG_STR [-t] [--log.level fatal|error|warn|info|debug|trace
      ] [-w COUNT] [-l LOG]
        bin/logstash -i SHELL [--log.level fatal|error|warn|info|debug|trace]
        bin/logstash -V [--log.level fatal|error|warn|info|debug|trace]
        bin/logstash --help
      [2018-12-14T16:16:10,809][ERROR][org.logstash.Logstash    ] java.lang.IllegalSta
      teException: Logstash stopped processing because of an error: (SystemExit) exit
  </code></pre>
  
  <p>I delite all and exctract new code(default configs) and get this error anyway.</p>