You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who has won the indy 500 the most times?" whose answer is Al Unser.
Each document should contain about 30 words, and these documents should contain useful information.

Query: most wins in indy 500
Useful Output:

Doc 1: Foyt still owns the record for Indy car championships (7), starts (369), wins (67), podiums (117) and is the only driver to win the Indianapolis 500.
Doc 2: Who has won the most Indy 500s?  Helio Castroneves (2001, '02, '09, '21), Rick Mears (1979, '84, '88, '91), Al Unser (1970, '71, '78, '87) and
Doc 3: I know Al Unser won 5 in a row in 1970. He dominated the second half of 1970, and the first half of 1971 with 13 wins over 16 races. It was a
Doc 4: With Castroneves' win in the 2021 Indy 500, he tied A.J. Foyt, Al Unser and Rick Mears for the most wins all-time in the history of the race
Doc 5: Indy 500 Drivers With the Most Wins · 20. Tommy Milton · 19. Bill Vukovich · 18. Rodger Ward · 17. Gordon Johncock · 16. Emerson Fittipaldi · 15. Arie