nl_tokens: Create an index on the given collection
pl_tokens: function createIndexForCollection ( collectionName , indexField , indexOpts ) { var collection = mongoClient . collection ( collectionName ) ; collection . createIndex ( indexField , indexOpts , function ( err ) { if ( err ) { debugError ( 'Failed to create index for collection. collection = %s :: index = %j :: error = %j' , collectionName , indexField , err ) ; } else { <mask> ( 'Index created for collection. Collection = %s  :: index = %j' , collectionName , indexField ) ; } } ) ; }