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