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# Elasticsearch
Elasticsearch is a search engine based on the Lucene library. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents.
## Tips
## Calculate number of replicas
> N >= R + 1
N : number of nodes
R: Number of replicas
### How to resolve unassigned shards
https://www.datadoghq.com/blog/elasticsearch-unassigned-shards/#reason-3-you-need-to-reenable-shard-allocation