Elasticsearch 7 Quick Start Guide

Index APIs

An index is a place where data is stored, and it points to one or more physical shards. As mentioned previously, a shard is a worker unit that stores a certain amount of data in the index. A shard is a division of the data in the index that distributes the data in the Elasticsearch cluster. Since Elasticsearch is dynamic, shards commute between nodes to ensure balance in the cluster. When creating an index, a set number of primary shards is fixed. A node can have as many shard replicas as needed, and there is no restriction.

We can create an index using the following command:

PUT index_name{    “Settings”: {        “number_of_shards”: 4        “number_of_replicas”: 1    }}

The create index API also allows us to create the mapping. We can create the ...