Hey @shivamtiwari18
I must say thats a lot and out of my knowledge base for sure 
A while back this was posted here and here
There are other members that have very large environment/s im sure they will jump in for ya… Not sure how you setup your cluster but normally Opensearch/elasticsearch nodes would be separate from Graylog/MongoDb nodes. I do about 30-40 Gb a day, started off watching Elasticsearch/Graylog using metric’s tools (i.e,Cerebro, Grafana & Zabbix) incase something bad happens and adjust settings as needed. Thats all what I know 