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The minimum configuration required for Vespa's YQL userInput to function is:

1. A Vespa application with at least one search definition
2. A search query with a user input parameter defined in the YQL statement, such as "SELECT * FROM search WHERE userInput('query')"
3. Properly configured Vespa containers and nodes to handle and process the search query with user input.

Additionally, it may be necessary to configure user input settings such as ranking features, query operators, and query expansion parameters to optimize the user input functionality.