$ go get github.com/tj/es/cmd/es

export ES_ADDR=http://localhost:5555

$ es nodes memory

Ronan the Accuser

     Documents: 44,577,077
        Memory: 1.2 GB free (27%) – 3.0 GB used (72%)
      JVM Heap: 2.1 GB committed – 1.7 GB used
        JVM GC: 51 MB young – 4.3 MB survivor – 1.6 GB old
    Field Data: 1.1 GB (0 evictions)
  Filter Cache: 195 MB (58677 evictions)
   Query Cache: 0 B (0 evictions)
      ID Cache: 0 B
      Segments: 51 MB (873)

Plug

     Documents: 45,870,106
        Memory: 1.1 GB free (26%) – 3.0 GB used (73%)
      JVM Heap: 2.1 GB committed – 1.8 GB used
        JVM GC: 114 MB young – 4.0 MB survivor – 1.7 GB old
    Field Data: 1.2 GB (0 evictions)
  Filter Cache: 196 MB (59867 evictions)
   Query Cache: 0 B (0 evictions)
      ID Cache: 0 B
      Segments: 51 MB (843)

Dementia

     Documents: 44,171,226
        Memory: 1.1 GB free (27%) – 3.0 GB used (72%)
      JVM Heap: 2.1 GB committed – 1.8 GB used
        JVM GC: 122 MB young – 1.7 MB survivor – 1.6 GB old
    Field Data: 1.1 GB (0 evictions)
  Filter Cache: 193 MB (56776 evictions)
   Query Cache: 0 B (0 evictions)
      ID Cache: 0 B
      Segments: 50 MB (860)