Merge logs between date/time using filebeat

Question

I'm trying to push logs to elasticSearch using fileBeat ( No Logstash )

I want to send following log in single message but it get broken into multiple messages, every line becomes separate message

20161014 17:49:09.169 [ERROR] [Thread-2974] some.java.class.:70 - some.java.Exception: write failed. History: [requestHost=123-some.org.com, time=Fri Oct 14 17:49:05 GMT-07:00 2016, exception=java.net.SocketTimeoutException]
[requestHost=123-some.org.com, time=Fri Oct 14 17:49:07 GMT-07:00 2016, exception=java.net.SocketTimeoutException]
[requestHost=123-some.org.com, time=Fri Oct 14 17:49:09 GMT-07:00 2016, exception=java.net.SocketTimeoutException]
 Tried 3 times
        at java.lang.Thread.run(Thread.java:745)
20161014 17:49:09.169 [ERROR] [Thread-3022]

I want to merge all lines between 2 dates (1st and last line)

Here is my filebeat.yml snippet

 paths:
      - /test.log
      multiline.pattern: '^\[0-9]{8}'
      multiline.negate: true
      multiline.match: after

I need to know correct regex

I'm trying to solve this without using logstash

Answer 1

Using the following Filebeat configuration with the provided log sample produces two events where each message begins with the date.

I ran ./filebeat -c filebeat.yml -e -v -d "*" with the config below to test. I also tested the pattern on the Go playground.

filebeat.yml:

filebeat:
  prospectors:
    - paths: ["input.txt"]
      multiline:
        pattern: '^[0-9]{8}'
        negate:  true
        match:   after
output:
  console:
    pretty: false

Output:

{   
  "@timestamp": "2016-10-17T14:13:31.292Z",
  "beat": {
    "hostname": "host.example.com",
    "name": "host.example.com",
  },  
  "input_type": "log",
  "message": "20161014 17:49:09.169 [ERROR] [Thread-2974] some.java.class.:70 - some.java.Exception: write failed. History: [requestHost=123-some.org.com, time=Fri Oct 14 17:49:05 GMT-07:00 2016, exception=java.net.SocketTimeoutException]\n[requestHost=123-some.org.com, time=Fri Oct 14 17:49:07 GMT-07:00 2016, exception=java.net.SocketTimeoutException]\n[requestHost=123-some.org.com, time=Fri Oct 14 17:49:09 GMT-07:00 2016, exception=java.net.SocketTimeoutException]\n Tried 3 times\n        at java.lang.Thread.run(Thread.java:745)",
  "offset": 519,
  "source": "input.txt",
  "type": "log"
}   
{   
  "@timestamp": "2016-10-17T14:17:21.686Z",
  "beat": {
    "hostname": "host.example.com",
    "name": "host.example.com",
  },  
  "input_type": "log",
  "message": "20161014 17:49:09.169 [ERROR] [Thread-3022]",
  "offset": 563,
  "source": "input.txt",
  "type": "log"
}