search all users without result limit and change a property of found users:

var filterName = "*";
var paging =  utils.createPaging(-1, 0);
var sortBy = "userName";
 
var scriptUsers = groups.searchUsers(filterName, paging, sortBy);
logger.log("found:" + scriptUsers.length);

var j = 0;
//change a property of the user:
for each(var scriptUser in scriptUsers) {
    var p = scriptUser.person;
    if (p.properties["userStatus"] != "") {
        p.properties["userStatus"] = "";
        p.save();
        j = j+1;
    }
}
logger.log("### changed for users:" + j);