{
 "size": 0,
 "query": {
  "bool": {
   "filter": [
    {
     "range": {
      "@timestamp": {
       "gte": 1596572166943,
       "lte": 1596593766943,
       "format": "epoch_millis"
      }
     }
    },
    {
     "query_string": {
      "analyze_wildcard": true,
      "query": "hostname:localhost OR test"
     }
    }
   ]
  }
 },
 "aggs": {
  "2": {
   "date_histogram": {
    "interval": "30s",
    "field": "@timestamp",
    "min_doc_count": 0,
    "extended_bounds": {
     "min": 1596572166943,
     "max": 1596593766943
    },
    "format": "epoch_millis"
   },
   "aggs": {
    "1": {
  "avg": {
  "field": "mainunit.flow_count"
  }
 }
   }
  }
 }
}
 

size表示查詢結果中顯示多少條原始語句