By default, logstash output cannot partial update Elasticsearch but fully update.
In my case, I can only search some fields which need to update, when it comes to es, the fields which didn't searched will update as blank, it's not as expected.
for example, I have a document with {"a":1,"b":2}, my event is {"a":3}, my expected update result is {"a":3,"b":2}, but actually it's {"a":3}.
so how to partial update es in the output plugin of logstash? thanks first if any guys can help.
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