Convert strings to floats at aggregation time?

Question

Is there any way to convert strings to floats when specifying a histogram aggregation? Because I have documents with fields that are floats but are not parsed by elasticsear

Answer 1

You need this

{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "sensorId": "D14UD021808ARZC"
          }
        },
        {
          "match": {
            "variableName": "CAUDAL"
          }
        }
      ]
    }
  },
  "aggs": {
    "caudal_per_month": {
      "date_histogram": {
        "field": "timestamp",
        "interval": "month"
      },
      "aggs": {
        "totalmonth": {
          "sum": {
            "script": "Float.parseFloat(doc['value'].value)"
          }
        }
      }
    }
  }
}

For a field that's called value: Float.parseFloat(doc['value'].value)