Indexing Options
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 ]* ]
);