Having previously posted this problem to the APPLE DEVELOPER BUG REPORTING, today I received this response:
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Subject: Bug ID 22932796: SPOTLIGHT SEARCH does not find nor display many conacts.
Engineering has determined that your bug report (22932796) is a duplicate of another issue (22685912) and will be closed.
The open or closed status of the original bug report your issue was duplicated to appears in the yellow "Duplicate of XXXXXXXX" section of the bug reporter user interface. This section appears near the top of the right column's bug detail view just under the bug number, title, state, product and rank.
An example of the duplicate section from the bug reporter user interface with your bug and the duplicate bug info is included below:
22932796 SPOTLIGHT SEARCH does not find nor display many conacts.
State: Closed Product:
Rank: No Value
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Duplicate of 22685912 (Open or Closed; log in to see the actual state)
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If you have any questions or concerns, please update your report directly here: http://bugreport.apple.com/.
Apple Developer Support
Worldwide Developer Relations