performing UNION ALL on :
 left query:
{
  "from" : 0,
  "size" : 200,
  "query" : {
    "bool" : {
      "filter" : [
        {
          "bool" : {
            "must" : [
              {
                "term" : {
                  "firstname.keyword" : {
                    "value" : "Amber",
                    "boost" : 1.0
                  }
                }
              }
            ],
            "adjust_pure_negative" : true,
            "boost" : 1.0
          }
        }
      ],
      "adjust_pure_negative" : true,
      "boost" : 1.0
    }
  },
  "_source" : {
    "includes" : [
      "firstname"
    ],
    "excludes" : [ ]
  }
}
 right query:
{
  "from" : 0,
  "size" : 200,
  "query" : {
    "bool" : {
      "filter" : [
        {
          "bool" : {
            "must" : [
              {
                "bool" : {
                  "should" : [
                    {
                      "term" : {
                        "holdersName.keyword" : {
                          "value" : "Hattie",
                          "boost" : 1.0
                        }
                      }
                    },
                    {
                      "term" : {
                        "dog_name" : {
                          "value" : "rex",
                          "boost" : 1.0
                        }
                      }
                    }
                  ],
                  "adjust_pure_negative" : true,
                  "boost" : 1.0
                }
              }
            ],
            "adjust_pure_negative" : true,
            "boost" : 1.0
          }
        }
      ],
      "adjust_pure_negative" : true,
      "boost" : 1.0
    }
  },
  "_source" : {
    "includes" : [
      "dog_name"
    ],
    "excludes" : [ ]
  }
}