Upgrade your mutate filter to one that includes the copy option or upgrade Logstash to one that ships with a sufficiently recent mutate filter.
Alternatively, if the field you want to copy is a plain string you can use add_field instead of copy.
Upgrade your mutate filter to one that includes the copy option or upgrade Logstash to one that ships with a sufficiently recent mutate filter.
Alternatively, if the field you want to copy is a plain string you can use add_field instead of copy.
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