Filebeat time in log writed randomly

Hi!
Logstash write a log into file randomly. For example log file:

[2018-01-10 10:59:09,792] [DEBUG] [http-bio-3010-exec-102] etc
[2018-01-10 10:58:49,440] [DEBUG] [http-bio-3010-exec-104] etc
[2018-01-10 10:59:39,165] [DEBUG] [http-bio-3010-exec-102] etc
[2018-01-10 10:59:29,466] [DEBUG] [http-bio-3010-exec-13] etc
[2018-01-10 10:59:47,161] [DEBUG] [http-bio-3010-exec-65] etc
[2018-01-10 10:58:49,440] [DEBUG] [http-bio-3010-exec-104] etc

Time in the log file is not in order: 10:59:09,792 then 10:58:49,440 and etc. How can I solve the problem?

filebeat config:

filebeat:
  prospectors:

  - input_type: log
    paths:
      - /var/log/tomcat/server.log
    fields:  { application: app, component: tomcat, shorthostname: "server_tomcat", env: prod, system: test}
    fields_under_root: true
    close_inactive: 2m
    close_timeout: 1m
    close_renamed: true
    scan_frequency: 5s
    multiline:
        pattern: "^[[:space:]]+(at|...)|^Caused by:"
        negate: false
        match: after

logstash config:

input {
    beats {
        port => "3070"
    }
}

filter {
    if [message] =~ /^\s*$/ { drop { } }
    else {
        json { source => "event" }
   } 

 }

output {

if [system] == "test" {
    file {
        path => "/logs/system/%{+YYYY-MM-dd}/%{application}/%{component}/%{host}-%{+YYYY-MM-dd-HH}.log.gz"
        codec => line { format => "%{message}"}
        file_mode => 0644
        gzip => true
    }
  }
}

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