Alias creation getting slower

We are using Elasticsearch for our search application. currently we have 3
master nodes and 5 data nodes in our cluster with 160 indices with 5 shards
each and replica of 2.

Currently we have 20k users. We will create alias for each user with alias name
as user id. As the number of alias gets increased, time to add alias also
getting increased consistently. Now aliascreation takes upto 10 secs for
most of the time.

Is there any workaround for this.

PS : found similar case here
But no solution for this.

Thanks in advance

Ranjith Venkatesan

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