The option subtreeSearch will be renamed to bindOnly and set to true per default because subtreeSearch was set to false per default. With subtreeSearch set to false, NO search was done at all instead of e.g. a one- or baselevel search, just a ldap bind was done. That's why it is renamed to bindOnly.

A new option ldapScope is introduced with default set to subtree. The ldapScope controls the ldap search in case an ldap bind is not enough (bindOnly=false).