move this to its own function

[todo]

phalcon-elasticsearch/src/IndexBuilder.php

Lines 187 to 191 in ef95a6f

	* @todo move this to its own function
	*/
	if (self::$client->indices()->exists(['index' => $model])) {
	self::$client->indices()->delete(['index' => $model]);
	}

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This issue was generated by todo based on a @todo comment in ef95a6f when #13 was merged. cc @bakaphp.