Steps to reproduce:
1. Create a Document Type "numbers" containing fields of type Number, Decimal and Integer
2. Add a new "number" in the DL. Make sure you fill in all three fields with numeric values
3. Examine lucene index
- All 3 fields get indexed as "keyword" fields in the index
- All 3 fields get indexed as "numeric" fields in the index, thus enabling sortability of search results.