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Small Overview About Elastic Search?

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What is ElasticSearch?

Elasticsearch is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Elasticsearch is developed in Java and is released as open source under the terms of the Apache License.

Elasticsearch is a near real time search platform. What this means is there is a slight latency (normally one second) from the time you index a document until the time it becomes searchable.

A cluster is a collection of one or more nodes (servers) that together holds your entire data and provides federated indexing and search capabilities across all nodes. A cluster is identified by a unique name which by default is "elasticsearch". This name is important because a node can only be part of a cluster if the node is set up to join the cluster by its name.

In Elasticsearch, a Document is the unit of search and index.

Elasticsearch is powered by Lucene, a powerful open-source full-text search library, under the hood.

The relationship between Elasticsearch and Lucene, is like that of the relationship between a car and its engine.

Elasticsearch nodes currently running on your network, starting a single node will by default form a new single-node cluster named elasticsearch.

Video for Elastic Search

References

https://www.elastic.co/guide/en/elasticsearch/reference/5.1/_basic_concepts.html
http://www.elasticsearchtutorial.com/basic-elasticsearch-concepts.html
posted Jan 27, 2017 by Manish Tiwari

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