Document the issue search features (in issues list)
The search feature in issue list uses PostgreSQL's FTS for reliability (of the DB system) and performance reasons. The FTS works by transforming search text into lexemes and compare them to the stored text vectors. While this approach has its benefits, it also has some downsides. For example, if a search text does not contain meaningful lexical units or only has stop words like "the B&A", it search will not return anything.
Note that the merge request list still uses ILIKE
and can fuzzy-match.
Reported initially in https://gitlab.slack.com/archives/C03EZMMCPQX/p1706010779806139 (ephemeral/internal)
Edited by euko