Is there way to boost original term more while using Solr synonyms?

Question

For example I have synonyms laptop,netbook,notebook in index_synonyms.txt

When user search for netbook I want to boost original text more then expanded by synonyms? Is

Answer 1

As far as I know, there is no way to do this with the existing SynonymFilterFactory. But following is a trick you can use to get this behavior.

Let's say your field is called title. Create another field which is a copy of this, say title_synonyms. Now ensure that SynonymFilterFactory is used as an analyzer only for title_synonyms (you can do this by using different field types for the two fields — say text and text_synonyms). Search in both these fields but give higher boost to title than title_synonyms.

Here are sample field type definitions:

And here are sample field definitions:

Copy title field to title_synonyms:

If you are using dismax, you can give different boosts to these fields like so:

    title^10 title_synonyms^1