How to pass body to endPoint using a watcher

Hi,

I'm trying to call a public endpoint (p-log.herokuapp.com), sending the json-body in the request, using a sentinl watcher
The service p-log.herokuapp.com show me the request with headers but the body is always empty. Why???
Here below the code of my watcher:

   {
  "actions": {
    "call_external_endPoint": {
      "webhook": {
        "method": "POST",
        "host": "p-log.herokuapp.com",
        "port": 80,
        "path": "/endpoint/",
        "params": {},
        "body": "{{#toJson}}ctx.payload{{/toJson}}",
        "headers": {
          "Content-type": "application/json"
        }
      }
    }
  },
  "input": {
    "search": {
      "request": {
        "index": [
          "logstash*"
        ],
        "body": {
          "size": 0,
          "query": {
            "bool": {
              "must": [
                {
                  "match": {
                    "fields.EnvironmentName": "Production"
                  }
                },
                {
                  "range": {
                    "@timestamp": {
                      "gte": "now-10d/d",
                      "lt": "now/d"
                    }
                  }
                }
              ]
            }
          },
          "aggs": {
            "Applications": {
              "terms": {
                "field": "fields.ApplicationName.raw"
              },
              "aggs": {
                "Level": {
                  "terms": {
                    "field": "level.raw"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "condition": {
    "script": {
      "script": "payload.hits.total > 0"
    }
  },
  "trigger": {
    "schedule": {
      "later": "every 24 hours"
    }
  },
  "title": "TEST - Call External EndPoint",     
}

Could someone help me?
Thanks.

The script condition never matches, thus the watch is never executed, as you need to use ctx.payload.hits.total.

oh, I just realized you are not talking about the alerting feature. You might have more success in the forums of the specific product, instead of asking here. Sorry for the confusion.