how lucene creates indexes from documents

Question

I am new to lucene.I am confused about the indexing part.I have a resource where I have id,name,list of products and list of keywords. I am making name,products and keywords searchable(storing,analyzing and tokenizing them).I want to know how the indexing will be applied on my documents?Is it like a hash map as such?

Document d = new Document();
d.add(new TextField("name", cr.getData().name, Field.Store.YES));
for (int i = 0; i < cr.getData().products.size(); i++)
    d.add(new TextField("products", cr.getData().products.get(i),
    Field.Store.YES));
    for (int i = 0; i < cr.getData().keywords.size(); i++)
    d.add(new TextField("keywords", cr.getData().keywords.get(i),
                    Field.Store.YES));
        d.add(new StringField("id", cr.getData().id, Field.Store.YES));
        iw.addDocument(d);

Answer 1

No, this isn't a hashmap but inverted index .

First chapters of Information Retrieval book should give you more details on how this works.