Size mapper plugin - how to see it in Kibana?

Elastic Stack Elasticsearch
1

I am going to try that again, since there where already some topics about it:

I have installed: Mapper Size Plugin | Elasticsearch Plugins and Integrations [7.15] | Elastic on my 7.13.2 cluster and I have created a new index with this mapping:

mappings": {
    "_size": {
      "enabled": true
    }
  }

I can see the _size indexed correctly in the json event:

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But I cannot select this field for filtering and I cannot use this field in visualizations:

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  1. How I can use the _size field now for filtering and visualization
  2. Am I able to enable the _size field in the index template?
2

I have set the _size in the Metafields in Advanced Settings in Kibana and now I can select this field for visualizations. Thanks to: