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
- When you make a search request, the node that receives it forwards it to a set of shards that contain all your data. These can be either primary shards or replicas, and are chosen in a round-robin fashion.
- Then, the coordinator node gathers the results from those shards, aggregates and sorts them, and sends the results back to the client.
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📖 Elasticsearch in Action
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How Search Engines Work
Search engines utilise web crawlers (also called spiders or bots) to crawl the web and fetch information about web pages. As they crawl each page, they index and store data such as page content, metadata, links and more.
This indexed data i...
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