Lucene integration and special character handling in Search

EDG uses the Apache Lucene library for indexing text. A text index is built on system startup, if it does not already exist. The indexer is using Graph Listeners and is updated in near real time as data changes. Users with administrator privileges can rebuild the cache on demand using the Cached Graphs administration page (see EDG Administration and Configuration).

Changing to Lucene WhitespaceAnalyzer

By default, both Search the EDG and the EDG editor search panel use the Lucene index StandardAnalyzer.

The default StandardAnalyzer drops characters such as / and – while the WhitespaceAnalyzer preserves them.

To search over special characters (such as / ? and -), an administrator must enable the WhitespaceAnalyzer option in EDG Configuration Parameters. After making a change in analyzer, the administrator needs to rebuild the indices using Text Indices and Search the EDG Index.