collection.update( query, update, true, false, writeConcern );
}
@Override
public void removeAssociation(AssociationKey key, AssociationContext associationContext) {
AssociationStorageStrategy storageStrategy = getAssociationStorageStrategy( key, associationContext );
WriteConcern writeConcern = getWriteConcern( associationContext );
if ( storageStrategy == AssociationStorageStrategy.IN_ENTITY ) {
DBObject entity = this.prepareIdObject( key.getEntityKey() );
if ( entity != null ) {