DrillDownQuery adding more than one filter for a dimension

[Sadaf <Sa...@tpsgc-pwgsc.gc.ca>]

Hi,

I am using Lucene4.4. I am using the SimpleFacetsExample that is in the
demo. DrillDownQuery works fine when I have only one filter. But, then I
tried to add another filter:
My code:
    q.add(new CategoryPath("Date/2010", '/')); 
    q.add(new CategoryPath("Date/2012", '/')); 

I got this error: "java.lang.IllegalArgumentException: dimension 'Date' was
already added"

So, I tried the Lucene4.8 SimpleFacetsExample from the demo. In this
version, I was able to add more filters, and everything worked nicely:
	       q.add("Date", "2010");
	       q.add("Date", "2012");

Do I have to upgrade to 4.8 to be able to use more than one filter? We have
a huge application, and the upgrade won't be straightforward. Is there a way
I can do this with Lucene4.4? If we do upgrade, do we have to upgrade to 4.8
or can I upgrade to a lower version (4.7?) so that I have to make fewer
changes? We have a tight deadline and I really appreciate the help.




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