Last updated March 16, 2011.
This list was previouly being maintained at http://groups.drupal.org/node/10569
This is a list of issues in the D7 issue queue that pertain to search. They've been vetted and confirmed to be real issues. They cover the entire spectrum, from advanced feature requests to bugs to theming issues.
For previous Drupal versions, check the issue queue directly.
For Drupal 7, you can also check the issue queue, as all of the issues in the search.module component have actually been vetted as real issues that need fixing. This list may become out of date, so probably the issue queue is the best place to look.
For Drupal 8 and beyond, please see the attached page: http://drupal.org/node/717654
Important Drupal 7 bugs
Probably most of these should be moved to the Drupal 6 queue when fixed.
Search preprocessing and indexing
- #611732: Function search_index regex results in messed up search_node_links table
- #365661: wrong behaviour of the search module indexing logic doesn't allow to find a c++ book by "c++" keyword
- #205202: Fix search index link handling for non-existent nodes
- #131559: JavaScript inside node with PHP filter is not all stripped out
- #108100: Need smarter search splitting on underscores, hyphens, apostrophes and other characters
Search results display and UI
- #146278: Searching help desperately needed on search page
- #278958: Improve usability of advanced search form
- #916086: search_excerpt() doesn't highlight words that are matched via search_simplify()
Other Miscellaneous Important Issues
- #84490: Exclude users never logged in from the search results
- #312395: Queries on search admin and node indexing are slow for many-node sites
- #369471: search_comment_publish() fails on bulk comment operations
- #601810: The search query extender should be made more robust
- #733054: Watchdog logging of all searches is performance hit; need ability to turn it off
- #893302: Search ranking based on the factor "number of comments" & "No of Page Views" is broken
- #987210: Language-specific searches should include language neutral content