The min aggregation is how we will find the minimum value of the downloadTotal field in the entire index/type:

GET bigginsight/_search
{
 "aggregations": {                    
    "download_min": {                  
      "min": {                         
        "field": "downloadTotal"       
      }      
    }
  },
  "size": 0                            
}

Now, let's take a look at max aggregation.