Unable to ingest JSON file and output to stdout

Elastic Stack Logstash
5

@Luca_Belluccini, thanks for you input.

I've removed the timestamped path.data and I've revised the input as follows:

 input {
  file {
    codec => json
    path => ["/db/seed/test.json"]
    sincedb_path => "logstash/data/plugins/inputs/file/sincedb_file"
    start_position => "beginning"
  }
}

Unfortunately, the results are still the same. I've also added --log.level=debug and am seeing this re-occurring repeatedly after the Logstash API endpoint has started:

[2020-04-07T16:17:31,712][DEBUG][logstash.instrument.periodicpoller.cgroup] One or more required cgroup files or directories not found: /proc/self/cgroup, /sys/fs/cgroup/cpuacct, /sys/fs/cgroup/cpu
[2020-04-07T16:17:31,917][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2020-04-07T16:17:31,920][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2020-04-07T16:17:35,855][DEBUG][org.logstash.execution.PeriodicFlush][main] Pushing flush onto pipeline.