Here's how I achieved what you're trying to gain via a custom module - it will require you to set up a collection of your blog table, or use the Amasty custom blog collection if you want. (My code was written for Algolia search 1.5.5 on Magento 1.9.2.4CE)
public function indexProducts() {
if (class_exists('AlgoliaSearch\Client', false) == false)
{
require_once Mage::getBaseDir('lib').'/AlgoliaSearch/Version.php';
require_once Mage::getBaseDir('lib').'/AlgoliaSearch/AlgoliaException.php';
require_once Mage::getBaseDir('lib').'/AlgoliaSearch/ClientContext.php';
require_once Mage::getBaseDir('lib').'/AlgoliaSearch/Client.php';
require_once Mage::getBaseDir('lib').'/AlgoliaSearch/Index.php';
require_once Mage::getBaseDir('lib').'/AlgoliaSearch/PlacesIndex.php';
require_once Mage::getBaseDir('lib').'/AlgoliaSearch/IndexBrowser.php';
}
$client = new \AlgoliaSearch\Client('YOUR_APP_ID', 'YOUR_ADMIN_API_KEY');
// YOUR COLLECTION HERE OF BLOG POSTS...
$collection = $this->getCollection();
$results = array();
$i = 0;
foreach ($collection as $post) {
$results[$i]['objectID'] = $post->getId();
$results[$i]['title'] = $post->getTitle();
$results[$i]['content'] = $post->getContent();
$i++;
}
// index in algolia you want to add to
$index = $client->initIndex('blog_index');
$batch = $results;
//print_R($batch);
$index->addObjects($batch);
}