Elasticsearch Basics

README.md

Elasticsearch	RDBMS
Document	Row
Type	Column
Index	Index

Cluster - collection of one or more nodes. Node - it has shards and replicas, it is the single instance of Elasticsearch Shard - distributor of data, it allows you to split data across different shards Replica - Copy of a shard Mapping - on how data should be stored in a document, including the data types, fields etc.

Tip: Do not load many shards to a single node, better to distribute it to other nodes.

Elasticsearch Rest API

Document API It has 2 types

1. Single Document API

   • Index API ( Adds or update a document to make it searchable.) Example: POST /{index-name}/{type:doc}/{id}
   • GET API
   • UPDATE API
   • DELETE API

2. Multi Document API

   • Multi GET API
   • Bulk API
   • Delete by query API
   • Update by query API
   • Reindex API