post_filter在es内部的执行流程是怎样的，它是怎么实现基于query的结果做二次筛选的

GET dwd_cr_supplier_business_view1/_search

{

  "_source": ["*"], 

  "query": {

    "bool": {

      "filter": [

        {

          "script": {

            "script": {

              "source": """

        long max_expiration_date = -2209017960L;

        long max_is_long_trem = 0;

        String newColumnName= "agreement."+params.columnName;

      Debug.explain(doc['agreement.value'].value);

Debug.explain(doc[newColumnName]);

        for (int i = 0; i < doc['agreement.expiration_date'].length; i++) {

           //Debug.explain(params.columnIn.contains((Integer)doc[newColumnName][i]));

          //数据边界内

          if(params.columnIn.contains((Integer)doc[newColumnName][i])){

            Debug.explain(doc['agreement.creator_id']);

                       Debug.explain(doc['agreement.creator_id'][i]);

             Debug.explain(doc['agreement.creator_id'][i]);

            //若是仅自己

           if(params.onlySelf){

              if(doc['agreement.creator_id'][i] == params.creatorId)

              {

                if(max_expiration_date<doc['agreement.expiration_date'][i])

                {

                  max_expiration_date = doc['agreement.expiration_date'][i]

                }

                                if(max_is_long_trem<doc['agreement.is_long_term'][i])

                {

                  max_is_long_trem = doc['agreement.is_long_term'][i]

                }

              }

           }

          }

          }

            Debug.explain(max_is_long_trem);

          if(max_is_long_trem==params.isLongTerm)

          {

            return true;

          }else{

            if (max_expiration_date >= params.expirationDateStart 

            && max_expiration_date < params.expirationDateEnd){

               return true;

            }

            return false;

          }

""",

              "lang": "painless",

              "params": {

                "columnName": "dept_id",

                "columnIn": [

                  12555

                ],

                "onlySelf": true,

                "creatorId": 695,

                "isLongTerm": 1,

                "expirationDateStart": 1830096000,

                "expirationDateEnd": 1830182400

              }

            }

          }

        },

        {

          "term": {

            "supplier_code.keyword": "LYZBKS0173869"

          }

        }

      ]

    }

  }

}