新人求助：logstash获取mysql数据，插入elasticsearch后，会把索引中原有的数据删除，只留最新的一条

logstash的配置文件如下：
  
input {
  jdbc {
  jdbc_driver_library => "/root/mysql-connector-java.jar"
  jdbc_driver_class => "com.mysql.jdbc.Driver"
  jdbc_connection_string => "jdbc:mysql://127.0.0.1:3306/james?characterEncoding=utf8&useSSL=false"
  jdbc_user => "app"
  jdbc_password => "app"
  jdbc_paging_enabled => "true"
  jdbc_page_size => "50000"
  statement => "select * from JAMES_MAIL"
  schedule => "* * * * *"
  type => "nametype"
  }
}

output {
  elasticsearch {
  hosts => "192.168.5.128:9200"
  index => "mysql_es-%{+YYYY.MM.dd}"
  document_id => "%{id}"
#  user => elastic
#  password => changeme
  }
  stdout {
  codec => json_lines
  }
}