Fantastich ElasticSearch: add numeric meta key

gistfile1.php

<?php
class My_Elasticsearch {

	public function __construct() {
		add_filter( 'elasticsearch_config_facets', array( $this, 'add_facets' ) );
		add_filter( 'elasticsearch_config_fields', array( $this, 'add_fields' ) );

		add_filter( 'elasticsearch_indexer_map_field', array( $this, 'indexer_map_field' ), 10, 2 );
		add_filter( 'elasticsearch_indexer_build_document', array( $this, 'indexer_build_document' ), 10, 2 );
	}

	public function add_facets( $facets ) {
		$facets[] = 'meta_price';

		return $facets;
	}

	public function add_fields( $fieldnames ) {
		$fieldnames[] = 'meta_price';

		return $fieldnames;
	}


	// not needed since it can be done via settings
	public function indexer_map_field( $props, $field ) {
		if( 'meta_price' == $field )
			$props['type'] = 'float';

		return $props;
	}

	public function indexer_build_document( $document, $post ) {
		if( 'arrangement' == $post->post_type ) {
			$document['meta_price'] = get_post_meta( $post->ID, '_price', true );
		}

		return $document;
	}

}

new My_Elasticsearch;

gistfile2.txt

  ["meta_price"]=>
  array(5) {
    ["_type"]=>
    string(5) "terms"
    ["missing"]=>
    int(6)
    ["total"]=>
    int(2)
    ["other"]=>
    int(0)
    ["terms"]=>
    array(2) {
      [0]=>
      array(2) {
        ["term"]=>
        float(10.140000343323)
        ["count"]=>
        int(1)
      }
      [1]=>
      array(2) {
        ["term"]=>
        float(2)
        ["count"]=>
        int(1)
      }
    }
  }

This does index the value but it doesn't return the facet correctly.

["meta_price"] => array(2) {
[10]=> int(1)
[2]=> int(1)
}