whethere solr 3.3 index file is compatable with solr 4.0

[syed kather]

Team

I have indexed my data with solr 3.3 version , As I need to use
hierarchical facets features from solr 4.0 .
Can I use the existing data with Solr 4.0 version or should need to
re-index the data with new version?



            Thanks and Regards,
        S SYED ABDUL KATHER