elasticsearch search query

GET _search
{
  
  "query": {
    "bool": {
      "must" : [
        { 
          "exists": { 
            "field": "exception.exception_class" 
          }
        },
        
        {
          "match": {
            "level": {
              "query" : "INFO"
            }
          }
        },
               
        {
          "range": {
            "@timestamp" : {
              "gte" : "now-1h",
              "lte" : "now",
              "time_zone": "+09:00"
            }
          }
        }
        
        
      ]
    }
  }
}