var toto = {
  "query": {
    "bool": {
      "must": [{
        "term": {
          "eventId": "afterWorkflowTaskEnded"
        }
      }, {
        "term": {
          "extended.modelName": "TravelExpenseValidation"
        }
      }, {
        "term": {
          "extended.taskName": "wf.travelExpenses.create"
        }
      }, {
        "range": {
          "eventDate": {
            "gte": "2015-11-03",
            "lte": "2015-11-10"
          }
        }
      }]
    }
  },
  "aggs": {
    "by": {
      "terms": {
        "field": "extended.taskActor"
      },
      "aggs": {
        "by": {
          "date_histogram": {
            "field": "eventDate",
            "interval": "day",
            "format": "yyyy-MM-dd",
            "min_doc_count": 0,
            "extended_bounds": {
              "min": "2015-11-03",
              "max": "2015-11-10"
            }
          },
          "aggs": {
            "metrics": {
              "sum": {
                "field": "extended.workflowVariables.amount"
              }
            }
          }
        }
      }
    }
  }
};