Sandbox
Packages 
Package Description
org.apache.lucene.payloads
Experimental classes for interacting with payloads
org.apache.lucene.sandbox.codecs.idversion
A primary-key postings format that associates a version (long) with each term and can provide fail-fast lookups by ID and version.
org.apache.lucene.sandbox.document
This package contains several point types: BigIntegerPoint for 128-bit integers LatLonPoint for latitude/longitude geospatial points
org.apache.lucene.sandbox.index
Experimental index-related classes
org.apache.lucene.sandbox.queries
Additional queries (some may have caveats or limitations)
org.apache.lucene.sandbox.search
This package contains a flexible graph-based proximity query, TermAutomatonQuery, and geospatial queries.