let options = ClientOptions::builder()
                  .hosts(vec![
                      StreamAddress {
                          hostname: "localhost".into(),
                          port: Some(27017),
                      }
                  ])
                  .build();

let client = Client::with_options(options)?;

// Constructor with a single address
let options = ClientOptions::builder()
    .hosts("localhost:27017")
    .build();
let client = Client::with_options(options)?;

// Constructor with multiple addresses, the first available from the list is chosen.
let options = ClientOptions::builder()
    .hosts(["localhost:27017", "localhost:27018"])
    .build();
let client = Client::with_options(options)?;