How do you define shards in Elasticsearch?

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Tags

1. #elasticsearch
2. #default
3. #allocated
4. #cluster
5. #shards
6. #least
7. #lucene
8. #nodes
9. #means
10. #another
11. #complete
12. #shard
13. #primary
14. #replica
15. #which
16. #total
17. #index