After match, get next lines in a watcher alert

Hi All,

I have configured a watcher alert that will search a particular query pattern. This is working fine and what i'm trying to achieve is to get the next 4 lines also added to notifications, if the above match is found. Currently we are getting only exact match line in the alert.

Could someone please help on this.

{
  "trigger": {
    "schedule": {
      "interval": "2m"
    }
  },
  "input": {
    "search": {
      "request": {
        "search_type": "query_then_fetch",
        "indices": [
          "applications-*"
        ],
        "rest_total_hits_as_int": true,
        "body": {
          "size": 1,
          "query": {
            "bool": {
              "must": [
                {
                  "match": {
                    "message": {
                      "query": "[message]",
                      "operator": "and"
                    }
                  }
                },
                {
                  "range": {
                    "@timestamp": {
                      "gte": "now-3m"
                    }
                  }
                }
              ]
            }
          },
          "_source": [
            "message",
            "beat.name",
            "@timestamp"
          ]
        }
      }
    }
  },
  "condition": {
    "compare": {
      "ctx.payload.hits.total": {
        "gt": 0
      }
    }
  },
  "actions": {
    "email_me": {
      "email": {
        "profile": "standard",
        "priority": "high",
        "to": [
          "test@test.com"
        ],
        "subject": "Test [Message)]",
        "body": {
          "text": "Message = Test {{ctx.payload.hits.hits.0._source.message}} - {{ctx.payload.hits.hits.0._source.@timestamp}} ] - Please review }"
        }
      }
    }
  },
  "metadata": {
    "color": "red"
  },
  "throttle_period_in_millis": 900000
}