Elasticsearch 面试题与答案

问题 36. What is the purpose of the 'CAT API' in Elasticsearch?

The CAT API provides concise information about the cluster, indices, and nodes in a human-readable format.

问题 37. Explain the purpose of the 'Analyzer' in Elasticsearch.

An analyzer in Elasticsearch is responsible for processing the text during indexing and searching. It includes a tokenizer and one or more token filters.

Example:

PUT /my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "custom_analyzer": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": ["lowercase", "my_custom_filter"]
        }
      }
    }
  }
}

问题 38. Describe the 'Search Shards' concept in Elasticsearch.

Search Shards are individual units of a search request distributed across nodes for parallel processing.

问题 39. What is a 'Node' in Elasticsearch?

A node is a single instance of Elasticsearch running on a machine. It is part of a cluster and stores data and participates in the indexing and search capabilities of Elasticsearch.

Example:

GET /_cat/nodes?v

问题 40. Explain the use of the 'Alias' feature in Elasticsearch.

Aliases are used to provide a permanent and abstract name to an index, simplifying index management and searches.