Filebeat does not complete on close_eof + --once - filebeat

Question

Using filebeat 7.5.2:
I'm using a filebeat configuration with close_eof enabled and I run filebeat with the flag --once. I can see the harvester reaching eof but the filebeat keeps going.
Flebeat conf:
filebeat.inputs:
- type: log
close_eof: true
enabled: true
paths:
- "${LOGS_PATH}"
scan_frequency: 1s
fields: {
machine: "${HOST}"
}
output.logstash:
hosts: ["192.168.41.6:5044"]
bulk_max_size: 1024
timeout: 30s
pipelining: 1
workers: 1
And I run it using:
filebeat run --once -v -c "PATH TO CONF..."
And some logs from the filebeat instance:
...
2020-02-04T18:30:16.950Z INFO instance/beat.go:297 Setup Beat: filebeat; Version: 7.5.2
2020-02-04T18:30:17.059Z INFO [publisher] pipeline/module.go:97 Beat name: logstash
2020-02-04T18:30:17.167Z WARN beater/filebeat.go:152 Filebeat is unable to load the Ingest Node pipelines for the configured modules because the Elasticsearch out
put is not configured/enabled. If you have already loaded the Ingest Node pipelines or are using Logstash pipelines, you can ignore this warning.
2020-02-04T18:30:17.168Z INFO instance/beat.go:429 filebeat start running.
2020-02-04T18:30:17.168Z INFO [monitoring] log/log.go:118 Starting metrics logging every 30s
2020-02-04T18:30:17.168Z INFO registrar/migrate.go:104 No registry home found. Create: /tmp/tmp.BXJtfiaEzb/data/registry/filebeat
2020-02-04T18:30:17.179Z INFO registrar/migrate.go:112 Initialize registry meta file
2020-02-04T18:30:17.192Z INFO registrar/registrar.go:108 No registry file found under: /tmp/tmp.BXJtfiaEzb/data/registry/filebeat/data.json. Creating a new re
gistry file.
2020-02-04T18:30:17.193Z INFO registrar/registrar.go:145 Loading registrar data from /tmp/tmp.BXJtfiaEzb/data/registry/filebeat/data.json
2020-02-04T18:30:17.193Z INFO registrar/registrar.go:152 States Loaded from registrar: 0
2020-02-04T18:30:17.193Z WARN beater/filebeat.go:368 Filebeat is unable to load the Ingest Node pipelines for the configured modules because the Elasticsearch out
put is not configured/enabled. If you have already loaded the Ingest Node pipelines or are using Logstash pipelines, you can ignore this warning.
2020-02-04T18:30:17.193Z INFO crawler/crawler.go:72 Loading Inputs: 1
2020-02-04T18:30:17.194Z INFO log/input.go:152 Configured paths: [/tmp/tmp.BXJtfiaEzb/*.log]
2020-02-04T18:30:17.206Z INFO input/input.go:114 Starting input of type: log; ID: 13918413832820009056
2020-02-04T18:30:17.225Z INFO input/input.go:167 Stopping Input: 13918413832820009056
2020-02-04T18:30:17.225Z INFO crawler/crawler.go:106 Loading and starting Inputs completed. Enabled inputs: 1
2020-02-04T18:30:17.225Z INFO log/harvester.go:251 Harvester started for file: /tmp/tmp.BXJtfiaEzb/dcbgw-20200124080032_darkblue.log
2020-02-04T18:30:17.231Z INFO beater/filebeat.go:384 Running filebeat once. Waiting for completion ...
2020-02-04T18:30:17.231Z INFO beater/filebeat.go:386 All data collection completed. Shutting down.
2020-02-04T18:30:17.231Z INFO crawler/crawler.go:139 Stopping Crawler
2020-02-04T18:30:17.231Z INFO crawler/crawler.go:149 Stopping 1 inputs
2020-02-04T18:30:17.258Z INFO pipeline/output.go:95 Connecting to backoff(async(tcp://192.168.41.6:5044))
2020-02-04T18:30:17.296Z INFO pipeline/output.go:105 Connection to backoff(async(tcp://192.168.41.6:5044)) established
... Only metrics here ...
2020-02-04T18:35:55.686Z INFO log/harvester.go:274 End of file reached: /tmp/tmp.BXJtfiaEzb/dcbgw-20200124080032_darkblue.log. Closing because close_eof is enabled.
2020-02-04T18:35:55.686Z INFO crawler/crawler.go:165 Crawler stopped
... MORE METRICS ...
2020-02-04T18:36:26.609Z ERROR logstash/async.go:256 Failed to publish events caused by: read tcp 192.168.41.6:49662->192.168.41.6:5044: i/o timeout
2020-02-04T18:36:26.621Z ERROR logstash/async.go:256 Failed to publish events caused by: client is not connected
2020-02-04T18:36:28.520Z ERROR pipeline/output.go:121 Failed to publish events: client is not connected
2020-02-04T18:36:28.520Z INFO pipeline/output.go:95 Connecting to backoff(async(tcp://192.168.41.6:5044))
2020-02-04T18:36:28.521Z INFO pipeline/output.go:105 Connection to backoff(async(tcp://192.168.41.6:5044)) established
... MORE METRICS ...
From this I'm outputing this to Logstash 7.5.2 running in the same Ubuntu 18 VM. Running Logstash with log level trace does not output any error.