List the number of primary shards per data node in Elasticsearch:

``` bash
curl localhost:9200/_cat/shards?h=node,prirep | awk '
$2 == "p" { 
  result[$1] += 1; total += 1
} END {
  for (var in result)
    printf "%s\t%s (%0.2f%%)\n",var,result[var],result[var]/total*100
}'
```

It's not exactly a one-liner but i tried to make the AWK somewhat legible.