Why does logs contain undefined in kibana logs
How can we identify the error
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Depending on your filters and rules, you might be trying to access an entry that does not exist. This would return undefined as Kibana is based on Javascript. Double check your rules and make sure they match your input data.
Can you share here exactly what you are seeing? The more information you can provide the more likely we’ll be able to identify the problem and help you find a solution.