Yes. How familiar are you with ldap? I'm sure you know this, but slapd is the actual daemon name, and the /etc/init.d/ldap script simply calls the slapd daemon.
That's why I say that I feel this is a good decision, to change the name of the startup script to slapd rather than ldap.
So, it simply means that yes, you have ldap, and that the server will be started with the slapd command. A quick install indicated that it's off by default, which makes sense, as it would have be configured before starting.
I assume you know something about ldap, or you wouldn't have installed it. (Of course, it's possible you've just installed it for the first time, to study it).
If you're just learning about it for the first time, I'm going to spam my own page on it,
Meanwhile, I'm giong to add this information to the page. Very glad you started this thread. I had no idea that they'd changed the name of the startup script.