Parsing Exception during Percentile Calculation

[Varun_Somani]

Seeing Parsing Exception when trying to calculate percentile across various fields, Any idea what can be done here?

Document:

{
  "county" : "Santa Clara",
  "city": "San Jose",
  "date" : 123432342342,
  "user" : {
    "0" : {
      "name" : "abc",
      "metrics" : {
        "m1" : 100.0,
        "m2" : 200.0
      }
    },
    "1" : {
      "name" : "abc1",
      "metrics" : {
        "m1" : 100.0,
        "m2" : 200.0
      }
    }
  }
}

Query Used:

"aggs" : {
    "percentile_agg" : {
        "percentiles" : {
            "field" : ["user.0.metric.m1", "user.1.metric.m1"],
            "percents": [
              50,
              90,
              99,
              99.9,
              100
            ],
          "hdr": { 
              "number_of_significant_value_digits" : 3
        }
        }
    }

Exception Seen:

{
  "error": {
    "root_cause": [
      {
        "type": "parsing_exception",
        "reason": "[percentiles] field doesn't support values of type: START_ARRAY",
        "line": 17,
        "col": 27
      }
    ],
    "type": "parsing_exception",
    "reason": "[percentiles] field doesn't support values of type: START_ARRAY",
    "line": 17,
    "col": 27
  },
  "status": 400
}

Would it be easier if I make user as an array? Using Elasticsearch 6.2