But my Master node is not fragile, it is fine. The Data Node 2 is the one who's busy and crashes sometimes, but it should not prevent me from seeing the index that Data Node 1 produces.
Even if I followed all the recommended steps, it doesn't answer my question: Master is good, Data node 1 is good and produce its own indexes, Data node 2 is down. Why can't I see Data node 1's data in Kibana (who connects to the Master node).
Here's a topology:
If Data Node 2 Elasticsearch fails, please confirm this: Should I see my Client A data still? Or is there something that the Master Node does that depends on Node 2 to be up as well? You know, like RAID and parity? Does the Master node move data around in some kind of parity way?