explain
select * from t1234
where 
   campaignid='Finland' AND adgroupid IN ('Lahti','Imatra')
   OR
   campaignid='Russia' AND adgroupid IN ('Petersburg', 'Moscow')
   OR 
   campaignid='Sweden' AND adgroupid IN ('Stockholm', 'Uppsala')
   OR 
   campaignid='Germany' AND adgroupid IN ('Berlin', 'Frankfurt')
   OR 
   campaignid='Belgium' AND adgroupid IN ('Brussels', 'Gent')
   OR 
   campaignid='Portugal' AND adgroupid IN ('Lisbon', 'Porto')
AAA

"tree": {
  "ranges": { B-F-G-P-R-S },
  "merges": [
    {
      "index_merge": {
        "tree": {
          "ranges": { B-F-G-R-S },
          "merges": [
            {
              "index_merge": {
                "tree": {
                  "ranges": { F-G-R-S },
                  "merges": [
                    {
                      "index_merge": {
                        "tree": {
                          "ranges": { F-R-S },
                          "merges": [
                            {
                              "index_merge": {
                                "tree": {
                                  "ranges": { F-R },
                                  "index_merge": { F or R }
                                },
                                "tree": { S }
                              }
                            },
                            {
                              "index_merge": {
                                "tree": { F },
                                "tree": { R },
                                "tree": { S }
                              }
                            },
                            {
                              "index_merge": {
                                "tree": { F R },
                                "tree": { R S }
                              }
                            }
                          ]
                        },
                        "tree": {
                          "ranges": { G } 
                        }
                      }
                    },
                    {
                      "index_merge": {
                        "tree": { F R } ,
                        "tree": { S } ,
                        "tree": { G } 
                      }
                    },
                    {
                      "index_merge": {
                        "tree": { F G R } ,
                        "tree": { G S } 
                      }
                    }
                  ]
                },
                "tree": { B } 
              }
            },
            {
              "index_merge": {
                "tree": {F R S},
                "tree": { G } ,
                "tree": { B } 
              }
            },
            {
              "index_merge": {
                "tree": { B F R S } ,
                "tree": { B G } 
              }
            }
          ]
        },
        "tree": { P }
      }
    },
    {
      "index_merge": {
        "tree": { F G R S } ,
        "tree": { B },
        "tree": { P }
      }
    },
    {
      "index_merge": {
        "tree": { F G P R S } ,
        "tree": { B P }
      }
    }
  ]
}