Here's some stuff for the java lucene faq that seem promising:
Quote:
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Originally Posted by java lucene docs
- The term is in a field that was not tokenized during indexing and therefore, the entire content of the field was considered as a single term. Re-index the documents and make sure the field is tokenized.
- The term you are searching is a stop word that was dropped by the analyzer you use. For example, if your analyzer uses the StopFilter, a search for the word 'the' will always fail (i.e. produce no hits).
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Maybe there's a stop filter on numeric stings? Or maybe the normalizer is dropping numeric strings from the title index.