Async client methods should not declare exceptions

[MT-Jacobs]

For my example, let's take a look at ElasticsearchAsyncClient#index:

	public <TDocument> CompletableFuture<IndexResponse> index(IndexRequest<TDocument> request)
			throws IOException, ElasticsearchException {
		@SuppressWarnings("unchecked")
		JsonEndpoint<IndexRequest<?>, IndexResponse, ErrorResponse> endpoint = (JsonEndpoint<IndexRequest<?>, IndexResponse, ErrorResponse>) IndexRequest._ENDPOINT;

		return this.transport.performRequestAsync(request, endpoint, this.transportOptions);
	}

Is it true that this method can actually throw an IOException? I'd expect that the CompletableFuture might return a failure (essentially wrapping the exception), but it's not actually throwing said exception. Am I missing some other checked IOException further down in the call chain? In the above example, RestClientTransport#performRequestAsync doesn't throw an IOException.

[swallez]

You're indeed right @MT-Jacobs, thanks for the catch. Neither IOException nor ElasticsearchException are actually thrown from async client methods. We'll remove them.