Insert Document into specific bucket using pure Java API

[vic0824]

Using SQL, it is easy to insert a document into a specific bucket.
I was trying to do the same using the Java API without using the Database.command() method, but I'm not sure what is the correct way of doing it.
In my use case, I create new buckets dynamically (they represent time ranges), so I don't have the full list of buckets at the time the Type is created, but for simplicity the sample code below assumes that the bucket already exists:

MutableDocument document = database.newDocument("product");
// omitted code to set property values
Bucket bucket = database.getSchema().getBucketByName("201407");
bucket.createRecord(document, true);
document.save();

Is this the right way? I have a few doubts:
1 - do buckets exists independently from types? When a new Type is created, the db engine automatically creates buckets for the type, but if I want to create a custom bucket I have to first create it from the schema and then add it to the Type. If I understand correctly, this is done to allow working in schema-less mode
2 - do I always need to call document.save()? In some examples it is called, in others it isn't
3 - what is the exact meaning of the discardRecordAfter parameter of the createRecord method? What value would produce the same result that is obtained by using "INSERT INTO product BUCKET 201407 " etc..?