TagsIndex.php

<?php
namespace Remindme\Search\Indexes;

use ElasticSearcher\Abstracts\IndexAbstract;

class TagsIndex extends IndexAbstract
{
	/**
	 * @return string
	 */
	public function getName()
	{
		return 'tags';
	}

	/**
	 * @return array
	 */
	public function getTypes()
	{
		return array(
			'tags' => array(
				'properties' => array(
					'id'  => ['type' => 'integer'],
					'tag' => ['type' => 'string', 'analyzer' => 'ngram_analyzer'],
				),
			),
		);
	}

	/**
	 * @return array
	 */
	public function getBody()
	{
		$body = parent::getBody();

		$body['settings'] = array(
			'filter'   => array(
				'ngram_filter' => array(
					'type'     => 'nGram',
					'min_gram' => 2,
					'max_gram' => 20
				)
			),
			'analyzer' => array(
				'ngram_analyzer' => array(
					'type'      => 'custom',
					'tokenizer' => 'whitespace',
					'filter'    => array(
						'lowercase',
						'asciifolding',
						'ngram_filter'
					)
				)
			),
		);

		return $body;
	}
}