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POST ocv*/_search
{
    "size": 0,
    "query": { "match_all": {} },
    "aggs": {
        "articles_over_time": {
            "date_histogram": {
                "field": "CreatedDate",
                "interval": "month"
            }
        }
    }    
}

{
    "size": 0, 
   "query": {
      "match_all": {}
   },
   "aggs": {
      "typesAgg": {
         "terms": {
            "field": "_type",
            "size": 0
         }
      }
   }
}