logstash停止,es数据清空问题

刚接触logstash还不太了解 ,今儿遇到个问题 :
配置好logstash输出日志到elasticsearch,传输正常;但我把filebeat和logstash停掉发现es中数据就没了, 求科普
logstash配置

input {

  beats {

    port => 5044

  }

}





output {

  elasticsearch {

        hosts => "127.0.0.1:9200"

        index => "%{[@metadata][beat]}-%{+YYYY.MM.dd}"

        document_type => "%{[@metadata][type]}"

        flush_size => 20000

        idle_flush_time => 10



  }

  stdout { codec => json_lines }

}