99th percentile and 95th percentile aggregation of response time is always coming higher than normal aggregation for the response time

Elastic Stack Elasticsearch
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As elastic search is calculating percentile using T-digest but every time the 95th and 99th percentile is coming higher than normal aggregation so i want to know that:

(a) is it possible that 99 or 95th percentile will be greater from normal aggregation calculation on all set of data?

(b) are we calculating percentile after sorting the actual data sets?Actually i want to know the exact working of T-digest so that i can figure it out that how it is doing calculation of percentile?

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