algoliasearch/src/main/java/com/algolia/search/saas/Index.java
public Request getObjectAsync(final @NonNull String objectID, final Collection<String> attributesToRetrieve, @Nullable CompletionHandler completionHandler) {
        return getObjectAsync(objectID, attributesToRetrieve, /* requestOptions: */ null, completionHandler);
    }
public Request getObjectAsync(final @NonNull String objectID, final Collection<String> attributesToRetrieve, @Nullable CompletionHandler completionHandler) {
        return getObjectAsync(objectID, attributesToRetrieve, /* requestOptions: */ null, completionHandler);
    }
Gets an object from this index, optionally restricting the retrieved content (asynchronously).

@param objectID             Identifier of the object to retrieve.
@param attributesToRetrieve List of attributes to retrieve.
@param completionHandler    The listener that will be notified of the request's outcome.
@return A cancellable request.