Quick Search not finding items

[dasymington]

Increasingly often I'm finding that UR doesn't find items that it should find when using Quick Search. The items it misses are often email (.eml) messages that I've imported, but it does miss other types of documents too. If I look at the list of keywords for an item, it does contain the keywords I enter in the search dialogue.

Is there any maintenance I can do on the database to sort this?