Elasticsearch date_histogram with interval shows incorrect dates

Question

I use date_histogram aggregation from Elasticsearch with interval of 2d and I also have a filter for one month. eg. from 2019-11-01 to 2019-11-31.

I have a mapping like this:

PUT test_index/test/_mapping
{
  "properties": {
    "date": {
      "type": "date",
      "format": "yyyy-MM-dd"
    }
  }
}

Then I insert data like this:

POST test_index/test
{
  "date": "2019-11-01", 
  "content": "hello world!"
}

POST test_index/test
{
  "date": "2019-11-02", 
  "content": "hello world!"
}

POST test_index/test
{
  "date": "2019-11-03", 
  "content": "hello world!"
}

Following is my query:

GET test_index/test/_search
{
  "query": {
    "match_all": {}
  },
  "size": 0, 
  "aggs": {
    "histogram": {
      "filter": {
        "range": {
          "date": {
            "gte": "2019-11-01",
            "lte": "2019-11-30"
          }
        }
      },
      "aggs": {
        "my_histogram": {
          "date_histogram": {
            "field": "date",
            "interval": "2d"
          }
        }
      }
    }
  }
}

I get this result:

{
  ...
  "aggregations" : {
    "histogram" : {
      "meta" : { },
      "doc_count" : 3,
      "my_histogram" : {
        "buckets" : [
          {
            "key_as_string" : "2019-10-31",
            "key" : 1572480000000,
            "doc_count" : 1
          },
          {
            "key_as_string" : "2019-11-02",
            "key" : 1572652800000,
            "doc_count" : 2
          }
        ]
      }
    }
  }
}

I get the first bucket with key 2019-10-31.

I would like to get the result starting from 2019-11-01.

Can you guys help me out, please?

I am using Elasticsearch 6.6.1.