Name: defaultsearchtier
Type: STRING
Default-Value:
Last-Modified: 3.0.0

Name of the default tier that messages will be indexed to. Search indexes
can be organized in tiers to allow index storage in different directories
and physical media. See the man page of squatter for details. The default
search tier also requires the definition of an according
*searchtierpartition-name* entry.

This option MUST be specified for xapian search.
