obsolete code in examples/search

[leeli0]

Path like /search/:query? isn't supported by express 5.x anymore. Also, the APIs of reids package has changed to async functions, the names changed to camel-cased style. How to update these outdated code? I tried to update one example, no one responded, so I think I may do something wrong.

[ujamX]

Hi, @leeli0

express 5.x using :query? is still possible but no longer recommended.
I think modifications will be needed to explicitly separate paths (e.g. /search and /search/:query), and use conditional logic to handle default values ​​if parameters are missing.

Redis clients require async/await for all operations.
Promises must be handled using wait or .then().
The function name has been changed to camelCase, so it needs to be modified accordingly.