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shards command is the detailed view of what nodes contain which
shards. It will tell you if it’s a primary or replica, the number of
docs, the bytes it takes on disk, and the node where it’s located.
Here we see a single index, with three primary shards and no replicas:
% curl 192.168.56.20:9200/_cat/shards wiki1 0 p STARTED 3014 31.1mb 192.168.56.10 Stiletto wiki1 1 p STARTED 3013 29.6mb 192.168.56.30 Frankie Raye wiki1 2 p STARTED 3973 38.1mb 192.168.56.20 Commander Kraken