search_multi_match.js

(function () {
	'use strict';

	const elasticsearch = require('elasticsearch');
	const esClient = new elasticsearch.Client({
		host: '127.0.0.1:9200',
		log: 'error'
	});

	const search = function search(index, body) {
		return esClient.search({index: index, body: body});
	};

	// only for testing purposes
	// all calls should be initiated through the module
	const test = function test() {
		let body = {
			size: 20,
			from: 0,
			query: {
				multi_match: {
					query: 'Bradford',
					fields: ['title', 'authors.*name'],
					minimum_should_match: 3,
					fuzziness: 2
				}
			}
		};

		console.log(`retrieving documents whose title or authors match '${body.query.multi_match.query}' (displaying ${body.size} items at a time)...`);
		search('library', body)
		.then(results => {
			console.log(`found ${results.hits.total} items in ${results.took}ms`);
			if (results.hits.total > 0) console.log(`returned article titles:`);
			results.hits.hits.forEach((hit, index) => console.log(`\t${body.from + ++index} - ${hit._source.title} (score: ${hit._score})`));
		})
		.catch(console.error);
	};

	test();

	module.exports = {
		search
	};
} ());