Search documents without specifying a column

[vttn]

How can I search documents without specifying a column i.e.

 _search?q=Foo

I tried

$this->Businesses->find('all')->where(['*'=>'Foo']);

Thanks

[lorenzo]

Use the _all column

[vttn]

$q = 'Foo';
$businesses = $this->Businesses->find('all')->where(function ($builder) use($q) {
            return $builder->query(new \Elastica\Query\SimpleQueryString($q));
        }); 

acts more like _search/?q=Foo