Elasticsearch heap

I am trying to understand what is feeling up my heap?
I see that caches are not filled up very much, but my process is taking 1.2G of RAM.
How is it explained and is it normal in my case?

"indices": {
"docs": {
"count": 1000000,
 "deleted": 8
},
"store": {
"size_in_bytes": 44862166,
 "throttle_time_in_millis": 0
},
"segments": {
"count": 12,
"memory_in_bytes": 428968,
"terms_memory_in_bytes": 318663,
"stored_fields_memory_in_bytes": 20032,
     "term_vectors_memory_in_bytes": 0,
     "norms_memory_in_bytes": 5376,
     "points_memory_in_bytes": 83793,
     "doc_values_memory_in_bytes": 1104,
     "index_writer_memory_in_bytes": 0,
     "version_map_memory_in_bytes": 0,
     "fixed_bit_set_memory_in_bytes": 0,
     "max_unsafe_auto_id_timestamp": -1,
     "file_sizes": {}
  },
  "translog": {
     "operations": 0,
     "size_in_bytes": 86
  },
  "request_cache": {
     "memory_size_in_bytes": 0,
     "evictions": 0,
     "hit_count": 0,
     "miss_count": 0
  },
  "recovery": {
     "current_as_source": 0,
     "current_as_target": 0,
     "throttle_time_in_millis": 0
  }
},
"os": {
  "timestamp": 1487488254850,
  "cpu": {
     "percent": 29,
     "load_average": {
        "1m": 0.46,
        "5m": 0.6,
        "15m": 0.65
     }
  },
  "mem": {
     "total_in_bytes": 53436141568,
     "free_in_bytes": 1439207424,
     "used_in_bytes": 51996934144,
     "free_percent": 3,
     "used_percent": 97
  },
  "swap": {
     "total_in_bytes": 0,
     "free_in_bytes": 0,
     "used_in_bytes": 0
  }
},
"process": {
  "timestamp": 1487488254850,
  "open_file_descriptors": 179,
  "max_file_descriptors": 65536,
  "cpu": {
     "percent": 14,
     "total_in_millis": 14300
  },
  "mem": {
     "total_virtual_in_bytes": 3720667136
  }
},
"jvm": {
  "timestamp": 1487488254871,
  "uptime_in_millis": 37463,
  "mem": {
     "heap_used_in_bytes": 164998176,
     "heap_used_percent": 15,
     "heap_committed_in_bytes": 1056309248,
     "heap_max_in_bytes": 1056309248,
     "non_heap_used_in_bytes": 64384968,
     "non_heap_committed_in_bytes": 68657152,
     "pools": {
        "young": {
           "used_in_bytes": 136151480,
           "max_in_bytes": 139591680,
           "peak_used_in_bytes": 139591680,
           "peak_max_in_bytes": 139591680
        },
        "survivor": {
           "used_in_bytes": 14743736,
           "max_in_bytes": 17432576,
           "peak_used_in_bytes": 17432560,
           "peak_max_in_bytes": 17432576
        },
        "old": {
           "used_in_bytes": 14102960,
           "max_in_bytes": 899284992,
           "peak_used_in_bytes": 14102960,
           "peak_max_in_bytes": 899284992
        }
     }
  },
  "threads": {
     "count": 41,
     "peak_count": 41
  },
  "gc": {
     "collectors": {
        "young": {
           "collection_count": 4,
           "collection_time_in_millis": 253
        },
        "old": {
           "collection_count": 1,
           "collection_time_in_millis": 63
        }
     }
  },
  "buffer_pools": {
     "direct": {
        "count": 19,
        "used_in_bytes": 54025246,
        "total_capacity_in_bytes": 54025245
     },
     "mapped": {
        "count": 30,
        "used_in_bytes": 44524145,
        "total_capacity_in_bytes": 44524145
     }
  },
  "classes": {
     "current_loaded_count": 9836,
     "total_loaded_count": 9836,
     "total_unloaded_count": 0
  }
},
"fs": {
  "timestamp": 1487488254878,
  "total": {
     "total_in_bytes": 173863387136,
     "free_in_bytes": 93614780416,
     "available_in_bytes": 84869767168,
     "spins": "true"
  },
  "data": [
     {
        "path": "/mnt/logs/elasticsearch-5.0.0/data/nodes/0",
        "mount": "/mnt/logs (/dev/md2)",
        "type": "ext3",
        "total_in_bytes": 173863387136,
        "free_in_bytes": 93614780416,
        "available_in_bytes": 84869767168,
        "spins": "true"
     }
  ],
  "io_stats": {
     "devices": [
        {
           "device_name": "md2",
           "operations": 2254,
           "read_operations": 0,
           "write_operations": 2254,
           "read_kilobytes": 0,
           "write_kilobytes": 9012
        }
     ],
     "total": {
        "operations": 2254,
        "read_operations": 0,
        "write_operations": 2254,
        "read_kilobytes": 0,
        "write_kilobytes": 9012
     }
  }
},
"transport": {
  "server_open": 45,
  "rx_count": 19,
  "rx_size_in_bytes": 1007,
  "tx_count": 19,
  "tx_size_in_bytes": 2565
},
"http": {
  "current_open": 3,
  "total_opened": indent preformatted text by 4 spaces3
},
"breakers": {
  "request": {
     "limit_size_in_bytes": 633785548,
     "limit_size": "604.4mb",
     "estimated_size_in_bytes": 0,
     "estimated_size": "0b",
     "overhead": 1,
     "tripped": 0
  },
  "fielddata": {
     "limit_size_in_bytes": 633785548,
     "limit_size": "604.4mb",
     "estimated_size_in_bytes": 0,
     "estimated_size": "0b",
     "overhead": 1.03,
     "tripped": 0
  },
  "in_flight_requests": {
     "limit_size_in_bytes": 1056309248,
     "limit_size": "1007.3mb",
     "estimated_size_in_bytes": 0,
     "estimated_size": "0b",
     "overhead": 1,
     "tripped": 0
  },
  "parent": {
     "limit_size_in_bytes": 739416473,
     "limit_size": "705.1mb",
     "estimated_size_in_bytes": 0,
     "estimated_size": "0b",
     "overhead": 1,
     "tripped": 0
  }

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