Implement populator and add corresponding command

Command/PopulateCommand.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace FOQ\ElasticaBundle\Command;
+
+use Symfony\Bundle\FrameworkBundle\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Output\Output;
+
+/**
+ * Populate the search index
+ */
+class PopulateCommand extends Command
+{
+    /**
+     * @see Command
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('foq:elastica:populate')
+            ->setDescription('Populates search indexes from providers');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->writeln('Populating indexes');
+
+        $populator = $this->container->get('foq_elastica.populator');
+        $populator->populate();
+
+        $output->writeln('Done');
+    }
+}

Populator.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace FOQ\ElasticaBundle;
+
+class Populator
+{
+    protected $providers;
+
+    public function __construct(array $providers)
+    {
+        $this->providers = $providers;
+    }
+
+    public function populate()
+    {
+        foreach ($this->providers as $provider) {
+            $provider->populate();
+        }
+    }
+}

ProviderInterface.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace FOQ\ElasticaBundle;
+
+interface ProviderInterface
+{
+    function populate();
+}