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Elasticsearch Cluster Layout

📖 Elasticsearch in Action

Terminology

  • Node = An Elasticsearch process. It's recommended to run each node on a separate server.
  • Cluster = Set of one or more nodes.
  • Shard = Part of an index, used for distributing data across the cluster.

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Elasticsearch divides each index into shards, which are standalone Lucene indices. These can be either primary shards or replicas. 

The number of shards and replicas per shard is set when a new index is created. After that, Elasticsearch takes care of evenly distrib...

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Distributed indexing

Indexing process

  1. When you index a document, the node that receives your HTTP request determines which shard should contain your document, based on a hash of the document’s ID.
  2. Then, it forwards the document to the node holding that prim...

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Distributed search

Searching an index requires Elasticsearch to query a set of shards that contain all your data. Since shards are distributed across multiple nodes, this query will be forwarded to multiple nodes.

Search process

  1. When you make a search request, the ...

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