Elastic Search : How to get most researched terms - symfony

Question

i m implemeting elasticsearch in a symfony2 project with fos_elastica.
everythings works fine ( indexing data, updating, etc.)
i m currently looking for user behavior analysis : i would like to get the 10 most user searches or keywords in order to re-query it .
for example :
if 45% of searches are about yellow balloons and 45% are about red balloons, i would like to suggest on my homepage some yellow or red balloons
firstly, i was thinking about creating a symfony2 entity to save user search with a timestamp then compute last 1000 searches to get the most famous keywords. although it would surely work , that would be resource killer.
i was wondering if elasticsearch is able to provide these and how to implement it .
i ve read that i could create an index to store my user queries ( and that would be awsome, cause i could use facets to compute them really easily ) , but i don t know how to do save it directly in elastic search from symfony2 without an dedicated entity.

Answer 1

Okay, i finally got it !
here are the different steps :
1) create a new index in config.yml with a specific mapping for your keywords search
in config.yml
indexes:
your_index:
types:
search:
mappings:
value: {type:string}
date : {type:date}
provider: acme\AppBundle\Service\SearchProvider
2) create a new class SearchProvider in Service directory
in acme\Appbundle\Service\SearchProvider
<?php
namespace acme\AppBundle\Service;
use FOS\ElasticaBundle\Provider\ProviderInterface;
use Elastica\Type;
use Elastica\Document;
class SearchProvider implements ProviderInterface
{
protected $searchType;
private $search;
public function __construct(Type $searchType)
{
$this->searchType = $searchType;
}
// the function you will call from your service
public function add( $search )
{
$this->search = $search;
$this->populate();
}
/**
* Insert the repository objects in the type index
*
* #param \Closure $loggerClosure
* #param array $options
*/
public function populate(\Closure $loggerClosure = null, array $options = array())
{
if ($loggerClosure) {
$loggerClosure('Indexing users');
}
$date = time();
$document = new Document();
$document->setData(array('value' => $this->search, 'date' => $date ) );
$this->userType->addDocuments(array($document));
$this->userType->getIndex()->refresh();
}
}
3) create a new service declaration in your service.yml
services:
acme.search_provider:
class: acme\AppBundle\Service\SearchProvider
arguments:
- #fos_elastica.index.recetas.search
tags:
- { name: fos_elastica.provider, index: your_index, type: search }
4) call your service to store new searches like this
$this->get("acme.search_provider")->add("kapoue");
kapoue will be added to the searches.
5) get all the search keywords and rank it with aggregation
$es = $this->get('fos_elastica.index.acme.search');
$query = new \Elastica\Query();
$aggregation = new \Elastica\Aggregation\Terms("top_hits");
$aggregation->setField('value');
$aggregation->setSize( 3 );
$query->addAggregation($aggregation);
$result = $es->search($query);
$mostResearched = $result->getAggregation("top_hits");
print_r ( $mostResearched ); die();