What is Elasticsearch replication and how does it work?

What is Elasticsearch replication and how does it work?

Elasticsearch replication is the process of duplicating data across multiple nodes to ensure high availability and fault tolerance. It works by creating replica shards that are copies of the primary shards.

Why is replication important in Elasticsearch?

Replication is crucial because it protects against data loss. If a node fails, the replica shards can be used to recover the data, ensuring that the system remains operational.

How can I configure replication in my Elasticsearch cluster?

You can configure replication by setting the number of replicas for your index when creating it or by updating the index settings later. For example, you can use the command: PUT /my_index/_settings {"number_of_replicas": 2}.

Can I have different replication settings for different indices?

Yes, you can set different replication settings for each index in your Elasticsearch cluster, allowing for tailored configurations based on your needs.