Jeff Bezos has invested in an Indianapolis-based search engine, ChaCha, which said today that it has raised $6M in funding in a round led by Bezos Expeditions, the personal investment firm of Jeff Bezos. The firm, which is developing a "human-powered" search engine, said it will offer searching using human guides using instant-messaging. Other investors in the firm include Rob Canion, founding CEO of Compaq, and Jack Gill, of Vanguard Ventures, along with others.