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What is a Node in Elasticsearch?

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A node is an instance of Elasticsearch. Different node types are Data nodes, Master nodes, Client nodes and Ingest nodes.

These are explained as follows:

  1. Data nodes hold data and perform an operation such as CRUD (Create/Read/Update/Delete), search and aggregations on data.
  2. Master nodes help in configuration and management to add and remove nodes across the cluster.
  3. Client nodes send cluster requests to the master node and data-related requests to data nodes,
  4. Ingest nodes for pre-processing documents before indexing.

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