I did not set this setting. I don't know, why this has been set to none.
This is the output:
see: https://paste.ee/p/7FDMO
This elasticsearch instance stores our production server logs and needs to be kept.
How can i minimize shards? I had another issue, where you had ansewerd my question there too 
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I wanted to minimize shard numbers after i solve this problem here.
Currently our logs are not stored to elasticsearch anymore 