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 {
      debug('Index created for collection. Collection = %s  :: index = %j',collectionName,indexField);
    }
  });
}
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 {
      debug('Index created for collection. Collection = %s  :: index = %j',collectionName,indexField);
    }
  });
}
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 { debug ( 'Index created for collection. Collection = %s  :: index = %j' , collectionName , indexField ) ; } } ) ; }
Create an index on the given collection
@param {String} collectionName
@param {Object} indexField see mongodb indexes
@param {Object} indexOpts see mongodb indexes options
Create an index on the given collection