Currently I have two versions of a field in different indexes. Here I use session.id and there I use sessionId.
I will make them equal in logstash for new values, but how can I change the old data via reindex?
I want to create an additional field sessionId and this field needs to have the value of session.id
i had to do something similar due to the change from filebeat mapping side and here is the script that i used
but i have it the other way around (a string must be written in an object)
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