Provides the ability to add participants to help search and is responsible for creating search indices.

## Package Specification

This package contains the API for adding content to the help search functionality and is responsible for indexing all contents of the help system. To add content, a plug-in must extend the `LuceneSearchParticipant` abstract class and point to it using the `org.eclipse.help.search.luceneSearchParticipant` extension point.

The package also provides an abstract class that extends `LuceneSearchParticipant` called `XMLSearchParticipant` which adds functionality for parsing XML documents.