rudeshark.net/src/db/elasticsearch.ts

import * as elasticsearch from 'elasticsearch';
import config from '../config';

// Init ElasticSearch connection
const client = config.elasticsearch ? new elasticsearch.Client({
	host: `${config.elasticsearch.host}:${config.elasticsearch.port}`
}) : null;

if (client) {
	// Send a HEAD request
	client.ping({
		// Ping usually has a 3000ms timeout
		requestTimeout: 30000
	}, error => {
		if (error) {
			console.error('elasticsearch is down!');
		} else {
			console.log('elasticsearch is available!');
		}
	});

	client.indices.create({
		index: 'misskey',
		body: {
			settings: {
				analysis: {
					analyzer: {
						bigram: {
							tokenizer: 'bigram_tokenizer'
						}
					},
					tokenizer: {
						bigram_tokenizer: {
							type: 'nGram',
							min_gram: 2,
							max_gram: 2
						}
					}
				}
			},
			mappings: {
				note: {
					properties: {
						text: {
							type: 'text',
							index: true,
							analyzer: 'bigram'
						}
					}
				}
			}
		}
	});
}

export default client;