Hello: We are encountering issues with elastic search. Our production index folder is around 145 GB. I want to fine tune the elastic search thread pool and want to start with default pool size for elastic search. 

I referred the below setting, I am not sure if this is applicable for Pega 8.6.1. Can someone confirm?

https://docs.pega.com/bundle/smart-claims-engine/page/smart-claims-engine/implementation-guide/sce-thread-pool.html

Also, Since the folder is around 145 GB, I want to see the number of shards default settings and increase them. How can i check the shard and size of each shard? If we set the number of shards, does Pega kick of re-indexing again?