Elastic
Useful links:
- How to resolve unassigned shards in Elasticsearch
- Elasticsearch failed shard recovery
- Creating an Elasticsearch Cluster: Getting Started
- Open Distro for Elasticsearch Kickstart guide
Troubleshooting
When shard failed to allocate:
GET _cluster/allocation/explain
...
shard has exceeded the maximum number of retries
...
POST _cluster/reroute?retry_failed=true