POST index-1/doc/1
{
  "@timestamp": "2015-01-01"
}
POST index-2/doc/1
{
  "@timestamp": "2013-01-01"
}
POST index-3/doc/1
{
  "@timestamp": "2011-01-01"
}
POST index-4/doc/1
{
  "@timestamp": "2009-01-01"
}

# Correctly returns buckets from 1970 to 2015
GET /index-*/_search
{
    "aggs": {
        "series": {
            "date_histogram": {
                "field": "@timestamp",
                "interval": "1y",
                "extended_bounds": {
                    "min": 0,
                    "max": 1447407264268
                },
                "min_doc_count": 0
            }
        }
    },
    "size": 0
}

# Only return buckets between 2009 and 2015 (extended_bounds is ignored)
GET /index-*,.kibana/_search
{
    "aggs": {
        "series": {
            "date_histogram": {
                "field": "@timestamp",
                "interval": "1y",
                "extended_bounds": {
                    "min": 0,
                    "max": 1447407264268
                },
                "min_doc_count": 0
            }
        }
    },
    "size": 0
}