SortFieldProvider
Reads/Writes a named SortField from a segment info file, used to record index sorts
Creates a new SortFieldProvider.
The provided name will be written into the index segment: in order to for the segment to be read this class should be registered with Java's SPI mechanism (registered in META-INF/ of your jar file, etc).
Parameters
name
The name this SortFieldProvider is registered under. must be all ascii alphanumeric, and less than 128 characters in length.