The following changes have been made between releases 2.21 and 2.3:

• Sql-filter that support MySQL added.

The following changes have been made between releases 2.2 and 2.21:

• Bug fixes.

The following changes have been made between releases 2.1 and 2.2:

• Java 5.0 is now supported/required.
• Faster spider.
• Indexing is made more robust.
• Updating an index was corrected.
• National character sets are now supported through java Local. This means that words containing non-ascii like characters are properly searchable.
• Some new search methods were included like ExtendedBoolean.
• Vector operations are now supported for integrators.
• Many more smaller adjustments.