Hi all!

A`m new in Graylog2, my question about the rotation and elasticsearch shard.

A have graylog rotation policy - 1GB per index and a maximum number of 10 
indices*.*
2 shards, 0 replica. 2 elasticsearch nodes.

es cluster:
es1 node master only + data. 
es2 data only.

# curl 'localhost:9200/_cat/indices/gray*?v'
health status index            pri rep docs.count docs.deleted store.size 
pri.store.size  
green  open   graylog2-prod_19   2   0    3888529            0    981.9mb 
       981.9mb  
green  open   graylog2-prod_26   2   0    2734000            0    975.6mb 
       975.6mb  
green  open   graylog2-prod_27   2   0    3312870            0    876.8mb 
       876.8mb  
green  open   graylog2-prod_18   2   0    3677397            0    930.1mb 
       930.1mb  
green  open   graylog2-prod_22   2   0    2664485            0    869.8mb 
       869.8mb  
green  open   graylog2-prod_23   2   0     355397            0    756.4mb 
       756.4mb  
green  open   graylog2-prod_24   2   0    1047500            0    950.9mb 
       950.9mb  
green  open   graylog2-prod_25   2   0    1273225            0    984.6mb 
       984.6mb  
green  open   graylog2-prod_20   2   0    3578967            0    928.4mb 
       928.4mb  
green  open   graylog2-prod_21   2   0    3233356            0    828.9mb 
       828.9mb

Why i have used space total for all es nodes ~18GB ?

I have 9.5GB used space disk on es1 and 9.5GB on es2. 
I have duplicated messages on es1 and es2?

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