Elasticsearch's output to logstash

My problem is: we need a re-matching process to the content in elasticsearch using logstash. So how to export the the data stored in the elasticsearch to logstash

Have a look at elasticsearch input plugin.

I use the default elasticsearch without a input plugin in yml

And it is the output part for the elasticsearch?

What does your logstash pipeline looks like?
In case you misunderstood my answer: https://www.elastic.co/guide/en/logstash/current/plugins-inputs-elasticsearch.html

It helps me a lot, the problem has been solved. Thanks

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