Basic, default weights:


$collection->createIndex( [ 'subject' => *'text'*, 'post' => *'text'* ] ),
Explicit weights:


$collection->createIndex(
    [ 'subject' => 'text', 'post' => 'text' ],
    [ *'weights' => [ 'subject' => 10 ]* ]
);
Wildcard field: text at any depth, default weights:


$collection->createIndex( [ *'$\*\*'* => 'text' ] ),
Wildcard: override default weights and explicit weights:


$collection->createIndex(
    [ '$\*\*' => 'text' ],
    [ *'weights' => [ '$\*\*' => 10, 'post' => 5 ]* ]
);