I have one index which has around 10K documents which may grow
max 20K documents in few years,And i have another index which has more than 20Million documents and likely to grow more than double or triple in a year.
how to pick my shards per index , this is for 3 node cluster all being master eligible [ node.master: true and node.data:true]
for 10K document shall i have 3 shards and 1 replica and for 20M documents index should i have 5 shards and 2 replica's ? If so , when i wanted to scale horizontally and add more nodes what will be the effect? and what should be the configuration if i wanted to add let's say 3 or 4 more nodes?