Solr 4 search server brings improvements and new features over Solr 1.4 with respect to
scalability, performance, and flexibility.
In particular, Solr 4 offers:
- More compact disc formats
- Faster index rebuilding
- Simpler and faster wildcard querying
- Use of doc values for faceting and ordering
- More accurate results and facet count
- Integrated Solr date math for d:date and d:datetime types
- Use of primitive types
- Support for spell checking and suggestion
- Support for site shortnames using SITE in queries and faceting using TAG
- Special tag support in queries and faceting