Hello,

We have discussed this in a ticket as well.

In current Lucene.NET engine this is not possible in an easy way.

You can develop a fully custom filter web part that will dynamically change the index used by the search results web part - each index will be indexing different path.

Or, easier solution is to add a ield to the document type that will indicate the location and then you can easily use the existing filter and filter out the results based on this field value. It is the same as using path value in the filter condition but instead you will use some string or integer value.

Best regards,
Juraj Ondrus