I manage a big Elasticsearch cluster with the following details:
Elasticsearch version 5.6.6
Dedicated Master nodes - 3
Data nodes - 56
Total nodes - 59
Data nodes details :
- 31 GB jvm heap;
- 4 x 1.8 TB SAS;
When I use the cluster/health API it displays 52 out of 56 data nodes, same for cat/health API, but the cat/nodes API display all my cluster nodes - 56.
I checked every node for disconnects and all seem to be connected and taking traffic.
Is there a way to check if the nodes are truly connected?