This plugin allows you to index your wiki and ticket data in a full text search engine and search it from a button in the main navbar. A back-end for Solr is provided, but any back-end can be added as this plugin creates an extension point.
This plugin is still under development. It seems to work much better then standard Trac search, but there may still be bugs. Submit bugs to https://github.com/dnephin/TracAdvancedSearchPlugin/issues.
You can check out TracAdvancedSearchPlugin from https://github.com/dnephin/TracAdvancedSearchPlugin
See the README for full instructions.