[Aggregations] Need a deprecation message for the percentiles parameter not allowing duplicate values

[cuff-links]

Summary

When we perform a query in 7.x with an aggregation, the percentiles parameter allows for an array of numbers. As per the docs, in 8.0, all of those values must be unique. Currently, we allow for duplicate values but we should be getting a deprecation warning. There is no warning.

Source

https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking-changes-8.0.html#breaking_80_aggregations_changes

How to Test

Run the following query in Dev Console:

GET latency/_search
{
  "size": 0,
  "aggs": {
    "load_time_outlier": {
      "percentiles": {
        "field": "load_time" ,
        "percents": [
          1,
          1,
          5,
          25,
          50,
          75,
          95,
          99
        ]
      }
    }
  }
}

Check the deprecation logs for a message.

[elasticmachine]

Pinging @elastic/es-analytics-geo (Team:Analytics)

[hendrikmuhs]

fixed by #65252