Question

In Lucene I need to add some information about the post for search. For make a better search I thing to add the tags name or some other information to make a bettter search. What option I choose whenever I have two possible option for solve this problem.

Append the tags into the content or excerpt of the post I have.

Or make a new index to solve the same puzzle.

Well I need to know what is different if I append them in existing index or make a new index in lucene to store an another kind of information.

Answer 1

You should add your tags to a separate tokenised tag field.

A typical query would look something like this:

content:(+honda +civic) +tag:red +tag:hatchback

The first two terms (honda and civic) are entered by the user, while the second two terms (red and hatchback) would be selected from a list of tags.

If you want to support tags that contain spaces, you will have to roll your own tokeniser by subclassing CharTokenizer: Lucene.Net support phrases?: What is best approach to tokenize comma-delimited data (atomically) in fields during indexing?

+tag:"5 door"

You can create a separate index for your tag field, but you will have to use a MultiSearcher to perform a combined search of the separated indexes.