[Website]: Percentile ranks aggregation - load_time_ranks example is wrong

[Vahor]

Type of issue

Inaccurate

What documentation page is affected

https://www.elastic.co/docs/reference/aggregations/search-aggregations-metrics-percentile-rank-aggregation

What happened?

Assume your data consists of website load times. You may have a service agreement that 95% of page loads complete within 500ms and 99% of page loads complete within 600ms.

After the example, the documentation says

From this information you can determine you are hitting the 99% load time target but not quite hitting the 95% load time target

but with those values it does not seems right:

 "aggregations": {
    "load_time_ranks": {
      "values": {
        "500.0": 55.0,
        "600.0": 64.0
      }
    }
  }
}

Here I read it as 55% of values are below 500 and 64% are below 600.

In 8.8

the example was

"500.0": 90.01,
"600.0": 100.0

with these values we have 100% below 600 so the 99% target is ok, and 90% for 500 so 95% is not quite hitting.

It seems the old value was correct.

Additional info

No response

[natasha-moore-elastic]

Hi @Vahor, thanks for reaching out and highlighting this. We’ve reviewed the issue and added it to our backlog for an upcoming sprint. We’ll keep this thread updated as we make progress. Your feedback helps us make the docs better for everyone. Thank you.