Data Lake for Enterprises

Shard in Elasticsearch

The data in Elasticsearch is stored and indexed in so-called Shards and the index brings in a logical grouping of one or more shards containing data stored having a common sense. Shard is something quite internal to Elasticsearch and index is something that we have to know of in Elasticsearch. The shard is the self-contained part in Elasticsearch, which can be distributed across multiple nodes in an Elasticsearch cluster. Shard allows Elasticsearch’s ability to scale horizontally (Scale out).

An index can be replicated into one or more shards as needed. Once replicated, an index has:

• Primary shards: Shard from which the replicated shards were created
• Replicated shards: Copy from the original (primary) shard

An index ...