One of clusters has the following specs
8 nodes (8 data and 5 master eligible) each with 15GB heap space running on servers with 32GB of RAM.
Elasticsearch version 7.6.2 on linux
each node has 8 TB of space allocated
around 30 billion documents are there
Each node has shards of 1443
total write i/o is around 350/sec
The application team is complaining the writes are slow, how can we improve writes to cluster?