Query on responded output

[Tanvir_Ahmmed]

How to write a conditional query on multiple fields?
Explain: I have an index let say "case" and the fields are "title", "secondTitle(contain nested obj)", "source(contain nested obj)". Now I want to search on title and want number of document inside of secondTitle, which also contains in source field of another document.

PUT /case_indx_tmp_tmp
{
  "mappings": {
    "properties": {
      "title":{
        "type": "text",
        "fields": {
          "title":{
            "type":"keyword"
          }
        }
      },
      "secondTitle":{
        "type": "nested",
        "properties": {
          "second_title":{
            "type":"text",
            "fields": {
              "secondtitle":{
                "type":"keyword"
              }
        }
          }
        }
      },
      "source":{
        "type": "nested",
        "properties": {
          "source_title":{
            "type":"text",
            "fields": {
              "sourcetitle":{
                "type":"keyword"
              }
        }
          }
        }
      }
    }
  }
}

PUT /case_indx_tmp_tmp/_doc/1
{
    "title" : "Case 1",
    "secondTitle" : [
        {
            "case_title" : "Case 2"
        }
    ],
    "source":[
      {
        "source_title":"Case 3"
      },
      {
        "source_title":"Case 4"
      }
    ]
}
PUT /case_indx_tmp_tmp/_doc/2
{
    "title" : "Case 2",
    "secondTitle" : [
        {
            "case_title" : "Case 3"
        },
        {
            "case_title" : "Case 4"
        },
        {
            "case_title" : "Case 1"
        }
    ],
    "source":[
      {
        "source_title":"Case 1"
      }
    ]
}
PUT /case_indx_tmp_tmp/_doc/3
{
    "title" : "Case 3",
    "secondTitle" : [
        {
            "case_title" : "Case 5"
        },
        {
            "case_title" : "Case 4"
        },
        {
            "case_title" : "Case 1"
        }
    ],
    "source":[
      {
        "source_title":"Case 2"
      },
      {
        "source_title":"Case 5"
      }
    ]
}
PUT /case_indx_tmp_tmp/_doc/4
{
    "title" : "Case 5",
    "source":[
      {
        "source_title":"Case 3"
      },
      {
        "source_title":"Case 4"
      },
      {
        "source_title":"Case 2"
      }
    ]
}

If search term is "Case" then it will return

title: Case 1
secondTitle_count: 1

title: Case 2
secondTitle_count: 3

title: Case 3
secondTitle_count: 2

title: Case 5
secondTitle_count: 0

My solution was, to iterate all documents which return after search query and make new bool query object for the "source" field where values are from secondTitle.

Thank You.