How to avoid rounding for currency values?

Building on the answer from Wrong returned Values on simple SUM-Aggregation, I have the following 3 documents in my dataset:

PUT sap-lo-po/_doc/1
{
  "EBELN": "4500017596",
  "EKPO": [
    {
      "NETWR": 149314.2
    }
  ]
}
PUT sap-lo-po/_doc/2
{
  "EBELN": "4500017596",
  "EKPO": [
    {
      "NETWR": 314.1
    }
  ]
}
PUT sap-lo-po/_doc/3
{
  "EBELN": "4500017596",
  "EKPO": [
    {
      "NETWR": 200
    }
  ]
}

I think the visualization based on this data is then correct: