CODEWITHSUNDEEP
elasticsearch
Bax
Bax

Reputation: 4466

What are elasticsearch indices?

They are not mentioned in ES glossary.

What is their relationship to other ES entities (shards / nodes / indexes) ?

Upvotes: 7

Views: 3220

Answers (2)

prayagupadhyay
prayagupadhyay

Reputation: 31192

Indices are equivalent to databases in Relational DBMS. Just like Relational Database has schema, ES index has mapping.

Shards => index is broken into shards (in order to distribute them and scale)

Replicas => copies of the shards (provide reliability if a node is lost)

I hope the following diagram(taken from Rafal Kuc's slides) demonstrates the relationship between ES Cluster, Index, Node and Shards.

ES diagram

Also, there's a nice stackoverflow post Shards and replicas in Elasticsearch by @javanna

Upvotes: 3

MeiSign
MeiSign

Reputation: 1507

Indices is the plural of index. If you have more than one index you call them indices. http://www.thefreedictionary.com/index

Upvotes: 10

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