Logstash 6.0.0:elasticsearch的未知设置–索引类型

我试图在ELK 6.0.0 docker image上运行logstash配置文件,但出现以下错误: elasticsearch的未知设置“index\u type”

我正在检索Spark streaming stats并将其发送给elasticsearch,但即使是这个简单的任务也会返回一个错误。这是我的代码:

input {
  graphite {
    codec => "json"
    port => 10513
    host => "0.0.0.0"
  }
}

output {
  #stdout { codec => "json" }

  elasticsearch {
    codec => "json"
    hosts => "localhost"
    index => "spark-%{+YYYY.MM.DD}"
    index_type => "spark"
  }
}