algoliasearch/src/main/java/com/algolia/search/saas/Index.java
public Request getObjectsAsync(final @NonNull Collection<String> objectIDs, @Nullable final RequestOptions requestOptions, @Nullable CompletionHandler completionHandler) {
        return getClient().new AsyncTaskRequest(completionHandler) {
            @NonNull
            @Override protected JSONObject run() throws AlgoliaException {
                return getObjects(objectIDs, null, requestOptions);
            }
        }.start();
    }
public Request getObjectsAsync(final @NonNull Collection<String> objectIDs, @Nullable final RequestOptions requestOptions, @Nullable CompletionHandler completionHandler) {
        return getClient().new AsyncTaskRequest(completionHandler) {
            @NonNull
            @Override protected JSONObject run() throws AlgoliaException {
                return getObjects(objectIDs, null, requestOptions);
            }
        }.start();
    }
Gets several objects from this index (asynchronously), optionally restricting the retrieved content (asynchronously).

@param objectIDs            Identifiers of objects to retrieve.
@param requestOptions       Request-specific options.
@param completionHandler    The listener that will be notified of the request's outcome.
@return A cancellable request.