Elasticsearch Not operator is not working

Question

I have some problems with NOT operator in Elastic search, Here is my query

{
  "query": {
    "filtered": {
      "query": {
        "query_string": {
          "query": "-et_tax:\"Agriculture\" -et_tax:\"Airports/Ports\"" 
        }
      }
    }
  },
 "aggs": {
    "lawfirmcount": {
      "cardinality": {
        "field": "pd_lawfirmID",
        "precision_threshold": 1250 
      }
    }
  }  
}

I am framing the query using PHP & MySQL. When i use the above it was showing wrong results, I need to exclude these results in my total results, I am expecting result is showing all the records but not in et_tax Column as Agriculture AND Airport/Ports. So how can i use the multiple NOT operator in my query.

UPDATE :

When i Pass the same query AND/OR both will show same results,

{
  "query": {
    "filtered": {
      "query": {
        "query_string": {
          "query": "-et_tax:\"Agriculture\" AND  -et_tax:\"Airports/Ports\""  
        }
      }
    }
  },
 "aggs": {
    "lawfirmcount": {
      "cardinality": {
        "field": "pd_lawfirmID",
        "precision_threshold": 1250 
      }
    }
  }  
}

The above with AND operator it will show 1564 records, and below query with OR operator it also shows the same count.

{
  "query": {
    "filtered": {
      "query": {
        "query_string": {
          "query": "-et_tax:\"Agriculture\" OR  -et_tax:\"Airports/Ports\""  
        }
      }
    }
  },
 "aggs": {
    "lawfirmcount": {
      "cardinality": {
        "field": "pd_lawfirmID",
        "precision_threshold": 1250 
      }
    }
  }  
}

Thanks in Advance,

Answer 1

try out this.

{
  "query": {
    "filtered": {
      "query": {
        "query_string": {
          "query": "* AND NOT (et_tax:\"Agriculture\" OR  et_tax:\"Airports/Ports\")"  
        }
      }
    }
  },
 "aggs": {
    "lawfirmcount": {
      "cardinality": {
        "field": "pd_lawfirmID",
        "precision_threshold": 1250 
      }
    }
  }  
}