Extract timestamp from log message

Elastic Stack Elasticsearch
1

I get log messages like this one:

Jul 20 14:15:29 ...

and I want to use grok filter (INGEST NODE in ElasticSearch) to extract timestamp (time and date) from this log in format like @timestamp (not string) . It necessary for me because I want to sort logs. Please, write down this filter.
NOTE: This variant does not work:

%{TIMESTAMP_ISO8601:timestamp}
2

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