Query builder design pattern?

I want to build a query builder for ElasticSearch but struggling to find the best pattern(s) to design it properly.

here is what I want to achieve

$builder
  ->index($indexString)
  ->type($typeString)
  ->query(function($builder){
    $builder->bool(function($builder){
      $builder
        ->must($field, $value)
        ->must($field2, $value2);
    });
  });

Any idea where to start or similar examples to learn from?