Elasticsearch 面试题与答案

问题 51. Explain the concept of 'Refresh' in Elasticsearch.

The 'Refresh' operation in Elasticsearch makes recent changes to the index immediately visible for search. It is an important aspect for near real-time search.

Example:

POST /my_index/_refresh

问题 52. Explain the term 'Fuzzy Query' in Elasticsearch.

A Fuzzy Query is used to find documents that match a specified term with a certain degree of error or similarity.

问题 53. What is the role of the 'Cat' API in Elasticsearch?

The 'Cat' API in Elasticsearch provides concise and human-readable information about the cluster, nodes, indices, and other components. It is useful for monitoring and debugging.

Example:

GET /_cat/indices?v

问题 54. What is the purpose of the 'Token Filter' in Elasticsearch?

Token Filters modify the tokens generated during the tokenization process, influencing the search and indexing process.

问题 55. How can you secure communication in Elasticsearch?

Communication in Elasticsearch can be secured using HTTPS. You can enable SSL/TLS to encrypt the data transmitted between nodes and clients for secure communication.

Example:

PUT /_cluster/settings
{
  "persistent": {
    "xpack.security.http.ssl.enabled": true
  }
}