Each log line is split into a different document in Elastic

Elastic Stack Logstash
4

A simplified version ML coded of this:

input {
  file {
    path => "/path/file.log"
    sincedb_path => "/dev/null"
    start_position => "beginning"
      codec => multiline {
      pattern => "^<pattern>" # how LS will recognize what is the first line
      negate => "true"
      what => "previous"
    }
}