ESIntegTestCase has a number of sugar index methods that prepare and execute
index requests. Now that index requests no longer use types, we can remove the
type parameter from each of these.
To prevent issues when re-compiling against the test framework, the method
`index(String index, String id, Object... source)` is renamed to `indexDoc`
so that e.g. `index(index, type, id, field1, field2, field3)` does not get re-interpreted
as an index request with an id of `type`.
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