To use Ingest Node, you at least need some json document that you send via the REST api, so you need to at least convert your file to json. I don't know logstash well enough to come up with a multi-line filter for this thing, better ask in the Logstash Forum about that. Why not use one of the script language clients like the perl client, the php client or the python client to do the file parsing and sent the resulting docs to ES?
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