Won't accept logs using standard syslog date format

So far I've added hosts to my logstash input that have used ISO8601 time format in their syslog config. Those have imported ok and the date/time is interpreted into the timestamp field. I have the following stanza in my logstash.conf:

   date {
     locale => "en"
     match => [ "timestamp", "MMM  d HH:mm:ss", "MMM dd HH:mm:ss", "ISO8601" ]

I then tried to add a host that has the default syslog date format of MMM dd HH:mm:ss and Logstash is choking on it's date for some reason with the following error:

[2019-05-06T06:31:23,884][WARN ][logstash.outputs.elasticsearch] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"logstash-2019.05.06", :_type=>"syslog", :_routing=>nil}, 2019-05-06T10:31:18.000Z {name=ludwig, id=081a9a13d60d41deb4c6e2229bdc197a, os={name=Ubuntu, family=debian, version=18.10 (Cosmic Cuttlefish), platform=ubuntu, codename=cosmic}, containerized=false, architecture=x86_64} May 6 06:31:18 ludwig nm-dispatcher: req:1 'dhcp4-change' [enp3s0]: start running ordered scripts...], :response=>{"index"=>{"_index"=>"logstash-2019.05.06", "_type"=>"syslog", "_id"=>"AWqMsrflWmfBzhmpAUtm", "status"=>400, "error"=>{"type"=>"mapper_parsing_exception", "reason"=>"failed to parse [timestamp]", "caused_by"=>{"type"=>"illegal_argument_exception", "reason"=>"Invalid format: "May 6 06:31:18""}}}}}

I see that the error is invalid format for the date, but I don't understand how it doesn't match.

Unless you tell it otherwise, the date filter will target the @timestamp field. So the date filter is unrelated to this problem.

elasticsearch is complaining that the timestamp (not @timestamp) field is not in a format that it can parse. Why it cannot parse it, or why it is even trying to parse it, is really an elasticsearch question, not a logstash question.

Uh, ok, but I have a feeling that they will send me right back here. Nevertheless, I'll re-ask on elasticsearch.

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