Hi shaunak,
Thank you for your interest.
I'm using the last version (5.1.1) of Elasticsearch, Kibana et Logstash.
Here is the result of the Request tab :
{
  "size": 0,
  "query": {
    "bool": {
      "must": [
        {
          "query_string": {
            "query": "*",
            "analyze_wildcard": true
          }
        },
        {
          "range": {
            "dernier update": {
              "gte": 1467323564738,
              "lte": 1483138364738,
              "format": "epoch_millis"
            }
          }
        }
      ],
      "must_not": []
    }
  },
  "_source": {
    "excludes": []
  },
  "aggs": {
    "2": {
      "date_histogram": {
        "field": "creation",
        "interval": "1M",
        "time_zone": "Europe/Paris",
        "min_doc_count": 1
      }
    }
  }
}
And for the Response tab :
{
  "took": 1,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 719,
    "max_score": 0,
    "hits": []
  },
  "aggregations": {
    "2": {
      "buckets": [
        {
          "key_as_string": "2015-03-01T00:00:00.000+01:00",
          "key": 1425164400000,
          "doc_count": 1
        },
        {
          "key_as_string": "2016-02-01T00:00:00.000+01:00",
          "key": 1454281200000,
          "doc_count": 1
        },
        {
          "key_as_string": "2016-04-01T00:00:00.000+02:00",
          "key": 1459461600000,
          "doc_count": 5
        },
        {
          "key_as_string": "2016-05-01T00:00:00.000+02:00",
          "key": 1462053600000,
          "doc_count": 6
        },
        {
          "key_as_string": "2016-06-01T00:00:00.000+02:00",
          "key": 1464732000000,
          "doc_count": 30
        },
        {
          "key_as_string": "2016-07-01T00:00:00.000+02:00",
          "key": 1467324000000,
          "doc_count": 88
        },
        {
          "key_as_string": "2016-08-01T00:00:00.000+02:00",
          "key": 1470002400000,
          "doc_count": 85
        },
        {
          "key_as_string": "2016-09-01T00:00:00.000+02:00",
          "key": 1472680800000,
          "doc_count": 151
        },
        {
          "key_as_string": "2016-10-01T00:00:00.000+02:00",
          "key": 1475272800000,
          "doc_count": 129
        },
        {
          "key_as_string": "2016-11-01T00:00:00.000+01:00",
          "key": 1477954800000,
          "doc_count": 114
        },
        {
          "key_as_string": "2016-12-01T00:00:00.000+01:00",
          "key": 1480546800000,
          "doc_count": 109
        }
      ]
    }
  },
  "status": 200
}
There is too many response... I asked a graph for the last 6 months.
Values from the 6 last months seem to be good, but older are not "normal" values (I have to check that, but less that 10 is not a normal result.