gistfile1.json

DELETE index1

PUT index1

PUT index1/type1/_mapping
{
  "properties": {
    "Comments": {
      "type": "nested",
      "properties": {
        "Description": {
          "type": "string",
          "analyzer": "english",
          "fields": {
            "folded": {
              "type": "string"
            }
          }
        }
      }
    },
    "Description": {
      "type": "string",
      "analyzer": "english",
      "fields": {
        "folded": {
          "type": "string"
        }
      }
    },
    "Title": {
      "type": "string",
      "analyzer": "english",
      "fields": {
        "folded": {
          "type": "string"
        }
      }
    }
  }
}

GET index1/type1/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "multi_match": {
            "query": "lisa",
            "fields": [
              "Title",
              "Description"
            ],
            "type": "cross_fields",
            "operator": "and"
          }
        },
        {
          "nested": {
            "path": "Comments",
            "query": {
              "filtered": {
                "query": {
                  "match_all": {}
                },
                "filter": {
                  "exists": {
                    "field": "Comments.Description"
                  }
                }
              }
            }
          }
        }
      ]
    }
  }
}