Elasticsearch Interview Questions and Answers

Ques 56. How can you handle high availability in Elasticsearch?

High availability can be achieved by configuring multiple nodes, using replicas, and implementing proper failover mechanisms.

Ques 57. Explain the concept of 'Routing' in Elasticsearch.

Routing in Elasticsearch is the process of determining which shard a document should be stored in. It is based on the document's routing value and helps distribute data evenly.

Example:

PUT /my_index/_doc/1?routing=user123
{
  "field": "value"
}

Ques 58. Explain the term 'Caching' in Elasticsearch.

Caching involves storing frequently used data to reduce the need for repeated computations, improving performance.

Ques 59. What is the purpose of the 'Cluster Health' API in Elasticsearch?

The 'Cluster Health' API provides information about the overall health of the Elasticsearch cluster, including the status of nodes, indices, and other vital statistics.

Example:

GET /_cluster/health

Ques 60. What is the purpose of the 'Routing' in Elasticsearch?

Routing determines which shard a document should be stored in based on a predefined value, optimizing search performance.