It is a distributed search engine based on the Lucene library. It supports quasi-real-time data retrieval NRT (near real-time), processing structured and unstructured data, and providing multitenant-capable full-text search engine capabilities with an HTTP web interface and schema-free JSON documents.
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What is Elasticsearch
- It is a real-time distributed storage, searches, and analysis engine
- Distributed storage
- Most of the data searched from Elasticsearch can be filtered out according to the score as long as the high score is returned to the user
- Hence, relevant results can be found even with less accurate keywords
- Near real-time (NRT)
- It is a slight delay (typically 1 second) from indexing a document until it is searchable
- It is an instance of a server that can run independently.
- It is identified by a unique name. It determines which servers in the network correspond to which nodes in the Elasticsearch cluster
- The unique name is important when you install multiple nodes in the same server although it is not recommended.
- A node is also a service unit that makes up a cluster.
- Its function is to store data and have indexing and searching capabilities.
Server: number of nodes = 1:N