If you need to manage several data streams for one LOGSTASH instance, you can configure the elasticsearch output like this in your logstash configuration:
We must use a filter to configure the data_stream parameters (type, dataset and namespace)
Badly formatted index, after interpolation still contains placeholder
Just to give context, in case you are facing the error above, its likely because Elasticsearch output does not accept field names to compose the data_stream name like it does for a normal "index" name.
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