I've been running elasticsearch cluster for more than 2 months. It was a
long journey and I finally came to the kafka river, which can make
elasticseach cluster more resilient because data pulling model is much more
stable than pushing model. Good thing is, I can totally stop elasticsearch
indexing without any data loss.
Question is, even though I stopped all indexing by stopping all river
instances, when I restarted one elasticsearch instance, the server status
became yellow. So, how can I update elasticsearch cluster without making
the server status yellow even there's no indexing and querying?